Question

Solve for x. 2x = 15 + x A: x = -15 B: x = 15 C: x = -15/2 D: x = 15/2

Answer 1

2x = 15 + x

First, our goal is to get 'x' to equal something by itself. To do so, we will have to do everything on one side. Let's subtract 'x' from each sides.
$2x - x = 15$

Second, our next step is to subtract '2x - x'. Since 'x' is basically considered (1), it will equal 'x'. 
$x = 15$

Answer: $\fbox { x = 15 }$