Respostas

2014-01-13T21:59:40-02:00
3.(x + 1) - 2.(x - 1) = - (x + 5)
3x + 3 - 2x + 2 = - x - 5
3x - 2x + x = - 5 - 3 - 2
x + x = - 10
2x = - 10
x = - 10/2
x = - 5

U = R { x = - 5 }
2014-01-13T22:29:54-02:00
3(x+1)-2(x-1)=-(x+5)
3x+3-2x+2=-x-5
3x-2x+x=-5-3-2
2x=-10
x=-10/2
x=-5