Answer:
Step-by-step explanation:
9)
x + x - 26 = 180
2x = 180 + 26
2x = 206
x = 206 : 2
x = 103
check
103 + 103 - 26 = 180
180 = 180
the answer is good
10.
2x - 40 = x + 10
x = 40 + 10
x = 50
2 * 50 - 40 = 50 + 10
60 = 60
