Step-by-step explanation:
-12.6x - 4.9x = -154
-17.5x = -154
17.5x = 154
x = 154/17.5
x = 8.8
#CMIIW
Answer:
137
(3 + 5 + 15 + x)/4 = 40
23 + x = 160
x = 137