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2y - 16 = -y + 12
2y + y = 12 + 16
3y = 28
y = 28 / 3
4y-2(y+8)=2y+3(4-y)
4y-2y-16=2y+12-3y
4y-2y-2y+3y=12+16
3y=28
y=28/3
y=9,33
⇒Ahora vemos si esta correcto:
4(9,33)-2((9.33)+8)=2(9,33)+3(4-(9,33))
37,32-2(17,33)=18,66+3(-5,33)
37,32-34,66=18,66-15,99
2,66=2,67
2,6=2,6
Espero te sirva :)