Verified answer

x/5 - x/2 = 19

MMC de 5 e 2 = 10

10/5 = 2.x = 2x

10/2 = 5.x = 5x

2x - 5x = 19

-3x = 19

x = -19/3

x/5 - 2x = 10

x - 10x = 50

-9x = 50

x = -50/9

.

quinta parte = x/5

dobro = 2x

x/5 - 2x = 19, mmc(5)

x - 10x = 95

-9x = 95

x = -95/9