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57=7c+5+6c
We move all terms to the left:
57-(7c+5+6c)=0
We add all the numbers together, and all the variables
-(13c+5)+57=0
We get rid of parentheses
-13c-5+57=0
We add all the numbers together, and all the variables
-13c+52=0
We move all terms containing c to the left, all other terms to the right
-13c=-52
c=-52/-13
c=+4
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