Respostas

2013-08-25T14:19:36-03:00
A) 5x-x+2=2-3x+15
5x-x+3x=2+15-2
7x=15
X=15/7

B) x+4x-4=9-2x-6
X+4x+2x=9-6+4
7x=7
X=7/7
X=1

C) 10-2x-1=8x+3
-2x-8x=3+1-10
(-1) -10x=-6
X=6/10
X=3/5

D) 7x-7=6x+2
7x-6x=7+2
X=9

E) x-x+1=12-3x+2
X-x+3x=12+2-1
3x=13
X=13/3
1 4 1