Respostas

2013-09-12T16:06:49-03:00
3(x+2)-1=2(x+3)-7
3x+6-1=2x+6-7
3x-2x=6-7-6+1
x= -6

x-3(4-x)=7x-(1-x)
x-12+3x=7x-1+x
4x-7x-x=-1+12
-4x=11
x= - 11/4
x= -2,75