Answer: 9) x = 2, 10) x = 3
Step-by-step explanation:
9) (9x+7)+(-3x+20) = 39
9x + 7 -3x + 20 = 39
6x + 27 = 39
6x = 12
x = 2
==========================
10) 3x + 5x = 24
8x = 24
x = 3
