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-9(c+4)=81
We move all terms to the left:
-9(c+4)-(81)=0
We multiply parentheses
-9c-36-81=0
We add all the numbers together, and all the variables
-9c-117=0
We move all terms containing c to the left, all other terms to the right
-9c=117
c=117/-9
c=-13
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