Flávia Barbosa
19/01/2018 • 15:38
1/4 + 3/5 + x = 1
5 + 12 + 20x = 20
------------------------
20
x = 3/20
3 ----- x
20----100
x= 15
5 + 12 + 20x = 20
------------------------
20
x = 3/20
3 ----- x
20----100
x= 15