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My math is a bit rusty so please bare with me. I am trying to solve this formula: $$x -(x y) = z, \quad \text{where}\quad y = 0.15 \quad\text{and}\quad z = 10 000.$$

How to get $x$?

This is what I have so far: $$x -(0.15x) = 10 000$$ $$-(0.15x) = 10000 - x$$ $$-x = (10000 - x)/0.15$$

Now I am stuck. Please help.

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1 Answer 1

up vote 4 down vote accepted

$x-xy=z$

$x(1-y)=z$

$x=\cfrac{z}{1-y}$ since $y \not= 1$

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Awesome. Thanks –  Willem Jan 20 '13 at 12:28

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