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-42=5c-45
We move all terms to the left:
-42-(5c-45)=0
We get rid of parentheses
-5c+45-42=0
We add all the numbers together, and all the variables
-5c+3=0
We move all terms containing c to the left, all other terms to the right
-5c=-3
c=-3/-5
c=3/5
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