Respostas

2013-11-26T15:23:38-02:00
7x-[5x+3-(2x+1)-10]=-(-x+3)
7x-[5x+3-2x-1-10]=x-3
7x-5x-3+2x+11=x-3
4x+8=x-3
4x-x=-3-8
3x=-11
x=-11/3
2013-11-26T15:24:18-02:00
Está aí o passo a passo
7x-[5x+3-(2x+1)-10=-(-x+3)7x - [5x+3-2x-1]-10= x-3
7x - [3x+2]-10=x-3
7x-3x-2-10=x-3
4x-12=x-3
4x-x=-3+12
3x=9
x=9/3
x=3