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x= -3+9
x=6
2) x-(-3)=4
x+3=4
x=4-3
x=1
4) 3x+5=-1
3x=-1-5
x=-6/3
x=-2
5) 4x-1=2x+1
4x-2x=1+1
2x=2
x=1
Olvidaste algunos signos en el 3 y 6!