Respostas

2013-11-26T11:43:31-02:00
X/2-x/4=5(tira mmc de 2 e 4) → (2x-x)/4=20/4 → x= 20
2013-11-26T12:00:41-02:00
X/2-x/4=5/1  
(2x - x)/4 = 20/4
x/4 = 5
x = 5 * 4
x = 20