Answer
$(x+y)(5+b)$
Work Step by Step
Using factoring by grouping, the factored form of the given expression, $
5x+5y+bx+by
,$ is
\begin{array}{l}\require{cancel}
(5x+5y)+(bx+by)
\\\\=
5(x+y)+b(x+y)
\\\\=
(x+y)(5+b)
.\end{array}
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