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x=12
b) 3x+17=92
3x=92-17
3x=75/:3
x=25
c) 125+5a=275
5a=275-125
5a=150/:5
a=30
d) 28+3s=70+2s
3s-2s=70-28
s=42
e) 3x+6=15+2x
3x-2x=15-6
x=9
f) 2x+18+x=6+x+24+x
2x+x-x-x=6+24-18
x=12
g) 5a+100=a+400+a
5a-a-a=400-100
3a=300/:3
a=100
h) 2m+31=4+5m
2m-5m=4-31
-3m=-27/:(-3)
m=9