Respostas

2014-08-20T22:00:56-03:00
Dessa maneira: 
2+x+-9
x= -9 -2
x= -11
Dessa maneira:
2+x= -9
x= -9 -2
x= -11
2014-08-20T22:02:44-03:00
2 + x = -9
=> x = -9 - 2
=> x = -11