How to solve this absolute value equation? Consider the absolute value equation:
|x| + |x-2| +|x-4|= 6
How to find the solution(s)?
My attempt:
For |x|, we got x, for x>=0 and -x, for x <0
For |x-2|, we got x-2, for x >= 0 and -(x-2), for x<0
For |x-4|, we got x-4, for x>=0 and -(x-4), for x<0
After this, I'm confused how to find the solutions? is it any easy way to find the solution?
Thanks
 A: I think you misunderstand the absolute value. 
Note that $$|x|=\begin{cases}x &\text{if $x\ge 0$}\\-x &\text{if $x\lt 0$}\end{cases}$$
So, for example, 
$$|x-2|=\begin{cases}x-2 & \text{if $\color{red}{x-2}\ge 0$}\\-(x-2)& \text{if $\color{red}{x-2}\lt 0$}\end{cases}$$
So, for your question, separate it into four cases as
(1) $x\lt 0$.
(2) $0\le x\lt 2$.
(3) $2\le x\lt 4$.
(4) $x\ge 4$.
A: You have 3 "nodes" for switching $|x|$ , $|x-2|$ and $x-4|$. The easiest way is to imagine real line with these points and split solution considering intervals $[-\infty,0],[0,2],[2,4],[4,\infty]$ separately. On each interval you can remove $||$ with certain sign and immediately solve the equation, checking that final solution is in the corresponding interval.
A: *

*$x<0$ leads to $6-3x=6$ 


Solve this equation and check wether the solution satisfies $x<0$. If so then you have found a solution of the original equation. If not then no solution exists that satisfies $x<0$.
Do the same for the cases:


*

*$0\leq x<2$

*$2\leq x<4$

*$4\leq x$
A: Define $n = x - 2$, and rewrite the equation.
$$|n-2| + |n| + |n+2| = 6$$
In this form we can easily see that if $n$ is a solution, so is $-n$. Thus WLOG we will assume that $n$ is positive. We can then remove some redundant $|\cdot|$s.
$$|n-2| + (n) + (n + 2) = 6 \implies |n-2| + 2n = 4$$
Clearly then, because $|n-2| \geq 0$, we have $|n-2| + 2n = 4 \implies n \leq 2$. This means that $n-2 \leq 0$ and so we can remove another $|\cdot|$.
$$-(n-2) + 2n = 4 \implies n = 2$$
And thus we have two solutions, $n = \pm 2$ or $\boxed{x = 0, 4}$.
A: Think of the modulus function measuring the distance from fixed points. So that $|x|=|x-0|$ is the distance from $0$.
So your sum measures the total distance from the points $0,2,4$
If $x$ is greater than $4$ the first two distances are greater than $4$ and $2$
If $x$ is less than $0$ we reach the same conclusion with the last two points by symmetry.
If $x$ is between $0$ and $2$ the total distance to $0$ and $2$ is always $2$, and the remaining distance is less than $4$. Similarly by symmetry for the points between $2$ and $4$.
Now check the points $0$, $2$, $4$ themselves
