what is - 7 y to the second power + 2y to the third power minus 7y + 4y to the third power + 6 y to the second power + 4 y to the second power + 3 y

-7y^2 + 2y^3 - 7y + 4y^3 + 6y^2 + 4y^2 + 3y. Ok.

First, combine - 7y^2 with 6y^2 and with 4y^2. =

Second, combine 2y^3 with 4y^3. =

Last, combine the terms - 7y and 3y. =

Combining meaning add.

Then, add all the sums of the like terms to get the answer. Answer is = 6y^3 + 3y^2 - 4y