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-9(c+-2)=12+3c
We move all terms to the left:
-9(c+-2)-(12+3c)=0
We add all the numbers together, and all the variables
-9(c-2)-(3c+12)=0
We multiply parentheses
-9c-(3c+12)+18=0
We get rid of parentheses
-9c-3c-12+18=0
We add all the numbers together, and all the variables
-12c+6=0
We move all terms containing c to the left, all other terms to the right
-12c=-6
c=-6/-12
c=1/2
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