Answer:
x = 3
Explanation:
Collect constant terms to RHS and Simplify
4x + 15 + (-15) = 9x + -15
4x = 9x - 15
Collect Terms with:- x to LHS and SImplify
4x + 9x = 9x - 15 + 9x
-5x = -15
Divide both sides by (-5) and Simplify
-5x = -15
-5x/-5 = -15/-5
x = 3