<u>Answer:</u>
x = 0.417 or x = -0.917
<u>Step-by-step explanation:</u>
We are given the following expression and we are to solve it for the variable x:

We will find the least common multiple of 2. 6 and 9:

Simplifying it to get:



Using the quadratic formula to solve for x:


or 
or 
The unknown number is 1/2 or 0.5.
ex: 4x+6=8
So basically your doing unit rates? Well guess what, I'm studying about that also, and I have a little understanding about unit rates, have you done ratios before?
Here you go. Just remember PEMDAS.
P-parentheses
E- exponents
M-multiplication
D-division
A-addition
S-subtraction
That is the order you will do it in.