Respostas

2013-07-03T12:54:22-03:00

3x-6=-4x+12

3x+4x=18

7x=18

x=18/7

2 4 2
2013-07-03T12:56:07-03:00

3(x-2)=4(-x+3)

3x-6=-4x+12

-6-12=-4x-3x

-18=-7x

x=18/7

1 5 1