Question

set up an equation for x in 12

Answer 1

Under the assumption that u and v are parallel, we have that both expressions: 12x-4, and 10x+10 are equal; because they are corresponding angles. So we have the equation

$12x-4=10x+10$

Let's solve it:

First step) Everything "with x" on the left-hand side, and everything else on the right-hand side.

$12x-10x=10+4$

Second step) Solving the sums.

$2x=14$

Third step) dividing by 2.

$x=\frac{14}{2}=7$