It is not possible to "solve" b+815 because it is an expression - not an equation or inequality.
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That factors to (a + 1)(a + b) a = -1, -b b = -a
Not enough information to solve
(b-4) squared
(a3 + b3)/(a + b) = (a + b)*(a2 - ab + b2)/(a + b) = (a2 - ab + b2)
-86