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2º: x=7
3ª: x=4
4º: x=32
4x=-12
x=-3
3x-10=18-x
4x=28
x=7
3(x-1)-7=6-x
3x-3-7=6-x
3x+x=6+10
4x=16
x=4
2x-1= (-7)^2
2x-1=49
2x=48
x=24