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-3(c-7)=-5c+39
We move all terms to the left:
-3(c-7)-(-5c+39)=0
We multiply parentheses
-3c-(-5c+39)+21=0
We get rid of parentheses
-3c+5c-39+21=0
We add all the numbers together, and all the variables
2c-18=0
We move all terms containing c to the left, all other terms to the right
2c=18
c=18/2
c=9
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