a3+b3
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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).
(a3 + b3)/(a + b) = (a + b)*(a2 - ab + b2)/(a + b) = (a2 - ab + b2)
10a + 5b
It is (B + b)/3.