Question

x +2 sobre 4 = 2 sobre 5

Answer 1

(x+2)/4 = 2/5
5.(x+2) = 4.2
5x+10 = 8
5x = 8-10
5x = -2
x = -2/5

ou

x/1 + 2/4 = 2/5
mmc (4 e 5) = 20
(20:1.x)/20 + (20:4.2)/20 = (20:5.2)/20
20x + 10 = 8
20x = 8-10
20x = -2
x = -2/20
x = -1/10