Respostas

2014-07-17T12:53:50-03:00
X+x-4=17-2x+1
2x-4=17- 2x+1
2x+2x= 17+1+4
4x= 22
x=22/4
x= 5.5

x+2x+3-5x=4x-9
x+2x-5x-4x =-9-3
3x-9x=-12
-6x=-12
x=-12/-6
x= -2