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Answer:
9y^3 -7y -5
Step-by-step explanation:
3y^3-y-5-5-6y+5+6y^3 . . . given
There are terms of degrees 3, 1, and 0. Combining them gives ...
y^3(3 +6) +y(-1 -6) +(-5 -5 +5)
= 9y^3 -7y -5