# Homework Help: Solve for 'x' (with 4 variables and 1 equation)

1. Aug 2, 2012

### PhizKid

1. The problem statement, all variables and given/known data
$$ac + bc = (a - c)(a + b) - xabcd^2$$

2. Relevant equations
Various factoring rules (difference of two squares, etc.)

3. The attempt at a solution
I got it expanded to:

$$ac + bc = a^2 + ab - ac - bc - xabcd^2\\0 = a^2 + ab - 2ac - bc - bd - xabcd^2$$

I tried factoring different ways, but it didn't really get me anywhere, and there aren't any "special" factoring rules that I can identify immediately here.

Never mind, I wrote down the problem incorrectly

Last edited: Aug 2, 2012
2. Aug 2, 2012

### Mentallic

Think of this:
What if you were asked to make x the subject (in other words, solve for x by putting it alone on one side of the equation) in the equation

$$a=b-cx$$

Can you solve this?