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-5(c+3)=30
We move all terms to the left:
-5(c+3)-(30)=0
We multiply parentheses
-5c-15-30=0
We add all the numbers together, and all the variables
-5c-45=0
We move all terms containing c to the left, all other terms to the right
-5c=45
c=45/-5
c=-9
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