6y2-4y-1+(3y2-2y+7)
Remove parentheses.
6y2-4y-1+3y2-2y+7
Add 6y2 and 3y2.
9y2-4y-1-2y+7
Subtract 2y from -4y.
9y2-6y-1+7
Add -1 and 7.
9y2-6y+6
Simplify 6y^2-4y-1+(3y^2-2y+7)
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