Respostas

2014-08-10T19:46:37-03:00
10x-8-2=7x-4
10x-7x=-4+8+2
3x=6
x=6/3
x=2
espero ter ajudado
3 2 3
2014-08-10T19:46:46-03:00
Isolando x:
10x-7x = -4+2+8
3x = 6
x = 6/3
x= 2