Question

8y= 64
20y-50=80
150y-25=+125y+50

Answer 1

Vamos lá:

8y = 64
y = 64/8
y = 8

20y - 50 = 80
20y = 80 + 50
20y = 130
y = 130/20
y = 13/2 = 6,5

150y-25=+125y+50
150y - 125y = 50 + 25
25y = 75
y = 75/25
y = 3

Bons estudos !