It is -10b - 7.
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The cube of A plus B is either A**3 + B or (A + B)**3 depending on what you intended to be cubed.
a(3+b)+c(3+b) * * * * * This is easy to finish: . . . = (a + c)(3 + b).
10a + 5b
It is (B + b)/3.
It is a2 - 9b2.