Question

Question was provided via image upload.

Explanation:

Step1: Eliminate constant on left

Add 5 to both sides:
$3x - 5 + 5 = 7x + 15 + 5$
$3x = 7x + 20$

Step2: Isolate x terms

Subtract $7x$ from both sides:
$3x - 7x = 7x + 20 - 7x$
$-4x = 20$

Step3: Solve for x

Divide by -4:
$\frac{-4x}{-4} = \frac{20}{-4}$

Answer:

$x = -5$