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65=5c+8c
We move all terms to the left:
65-(5c+8c)=0
We add all the numbers together, and all the variables
-(+13c)+65=0
We get rid of parentheses
-13c+65=0
We move all terms containing c to the left, all other terms to the right
-13c=-65
c=-65/-13
c=+5
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