Respostas

2013-12-05T01:05:54-02:00
X;/ x + 2 = 9 / 12
x . (12) = 9 . (x + 2)
12x = 9x + 18
12x - 9x = 18
3x = 18
x = 18/3
x = 6

Espero ter ajudado!
2013-12-05T01:08:14-02:00
Basta apenas jogar com a regra de 3:

\frac{X}{9}=\frac{X+2}{12}\\\\9x+18=12x \\\\9x-12x=-18\\\\3x=18\\\\\boxed{x=6}

Logo temos, x = 6 e x+2 = 8