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c+21=-5c-3
We move all terms to the left:
c+21-(-5c-3)=0
We get rid of parentheses
c+5c+3+21=0
We add all the numbers together, and all the variables
6c+24=0
We move all terms containing c to the left, all other terms to the right
6c=-24
c=-24/6
c=-4
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