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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-6=12+12
5x=24+6
5x=30
x=6
d)
6(x-2)-3x=2(x-2)+3
6x-12-3x=2x-4+3
3x-12=2x-1
3x-2x=-1+12
x=11
e)
11-(x+7)=3x-(5x-6)
11-x-7=3x-5x+6
4-x=-2x+6
-x+2x=6-4
x=2
f)
3(x-1)+4(x+1)=22
3x-3+4x+4=22
7x+1=22
7x=22-1
7x=21
x=3