I need help on this problem

Answer:
45, 135
Step-by-step explanation:
9x + 12x + 75 = 180
21x + 75 = 180
21x = 180 - 75
21x = 105
x = 105 / 21
x = 5
9 x 5 = 45
12 x 5 + 75 = 135