3y²-8y+7 from 9y²+5y+6
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(9y^2+5y+6)-(3y^2-8y+7)
9y^2+5y+6-3y^2+8y-7
9y^2-3y^2+5y+8y+6-7
6y^2+13y-1
Hope it helps
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