Respostas

2014-08-20T22:12:50-03:00
Multiplica cruzado.
(x + 1) x 3 = 3x + 3
1 x 1 = 1
3x + 3 = 1
3x= 1 - 3
3x = -2
x = -2/3
2014-08-20T22:30:46-03:00
X+1=1/3
x=1/3-1
x=(1-3)/3
x=-2/3 ou x=0,66666666...