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a)x+4=7
x=7-4
x=3
b)x-8=10
x=10+8
x=18
c)3x=12
x=12/3
x=4
d)x/6=2
x=2.6
x=12
78)
a)x+3=2x+1
3-1=2x-x
2=x
b) 4x+2=5x-1
2+1=5x-4x
3=x
c) 2(x-3)+3(x-4)=12
2x-6+3x-12=12
5x-18=12
5x=12+18
5x=30
x=6