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-13=4c-5
We move all terms to the left:
-13-(4c-5)=0
We get rid of parentheses
-4c+5-13=0
We add all the numbers together, and all the variables
-4c-8=0
We move all terms containing c to the left, all other terms to the right
-4c=8
c=8/-4
c=-2
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