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1-3x=4-2x
3=x
3x+3=x+4
2x=1
x=2
2(x+8)=40-x
2x+16=40-x
3x=36
x=12
4(x-2)=12-x
4x-8=12-x
5x=20
x=4
5x-5=4x+2
5x-4x=5+2
x=7