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97=13+4c
We move all terms to the left:
97-(13+4c)=0
We add all the numbers together, and all the variables
-(4c+13)+97=0
We get rid of parentheses
-4c-13+97=0
We add all the numbers together, and all the variables
-4c+84=0
We move all terms containing c to the left, all other terms to the right
-4c=-84
c=-84/-4
c=+21
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