Respostas

2014-02-20T13:16:10-03:00
5(3-x)7x=3(x-5)
15-5x 7x = 3x-15
-5x 7x -3x=-15-15
-1x=0 (*-1)
x=-0




2014-02-20T13:45:43-03:00
5(3-x)-7x=3(x-5)
15-5x-7x=3x-15
15-12x=3x-15
-12x-3x=-15-15
-15x=-30
x= -30\ -15
x= 2