Respuesta :

combine like terms
subtract 21 from both sides of the equation
simplify
divide both sides
y=-2
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Answer:

y = -2

Step-by-step explanation:

31 = 3 (y+7) - 8y

31 = 3y +21 - 8y

31 = -5y +21

10 = -5y

-2 = y

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