Answer
$-6y^3$
Work Step by Step
RECALL:
The distributive property states that for any real numbers $a, b$, and $c$,
$ac+bc=(a+b)c$
Use the rule above to obtain:
$=(-1+8-13)y^3
\\=(7-13)y^3
\\=-6(y^3)
\\=-6y^3$
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