Answer
$c=-50$
Work Step by Step
$6(5+c)=5(c-4)$ $\longrightarrow$distributive property
$30+6c=5c-20$ $\longrightarrow$addition property
$30+6c-30-5c=5c-20-30-5c$ $\longrightarrow$simplify
$c=-50$ $\longrightarrow$
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