(3y2+5y-8)-(-3y+7)
Apply the distributive property.
3y2+5y-8-(-3y)-1⋅7
Multiply -3 by -1.
3y2+5y-8+3y-1⋅7
Multiply -1 by 7.
3y2+5y-8+3y-7
3y2+5y-8+3y-7
Add 5y and 3y.
3y2+8y-8-7
Subtract 7 from -8.
3y2+8y-15
3y2+8y-15
Simplify (3y^2+5y-8)-(-3y+7)
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