Answer:
x = 7.5
Explanation:
3(x + 4.5) = 36.....distribute the 3 thru the parenthesis
3(x) + 3(4.5) = 36
3x + 13.5 = 36....subtract 13.5 from both sides
3x + 13.5 - 13.5 = 36 - 13.5.....simplify
3x = 22.5....divide both sides by 3
(3/3)x = 22.5 / 3
x = 7.5 <========
lets check it..
3(x + 4.5) = 36
3(7.5 + 4.5) = 36
3(12) = 36
36 = 36 (correct)...so it checks out