It is 8y - 8.
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If you mean: 3y^2-7y+3-5y+3-4y^2 then it is simplified to -y^2-12y+6
3y-8+5y = 2y-39 3y+5y-2y = -39+8 6y = -31 y = -31/6
That would depend on the plus or minus value of 3y or maybe an equality is missing none of which have been given.
y=x+5
12x - 9y = 6, 12x + 20y = 64 29y = 58 y = 2 x = 2