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....x-4=12
8x-4=12
8x=12+4
8x=16
x=16/8=2
b)
3x+...=15
3x+9=15
3x=15-9
3x=6
x=6/3=2
c)
-5x+8=-2
d)
4x+...=x+1
3x+(-5)=1