Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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.

share|cite|improve this question
up vote 4 down vote accepted



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

share|cite|improve this answer
Awesome. Thanks – Willem Jan 20 '13 at 12:28

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.