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90-c/5=13
We move all terms to the left:
90-c/5-(13)=0
We add all the numbers together, and all the variables
-c/5+77=0
We multiply all the terms by the denominator
-c+77*5=0
We add all the numbers together, and all the variables
-1c+385=0
We move all terms containing c to the left, all other terms to the right
-c=-385
c=-385/-1
c=+385
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