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4c+9=8c-13
We move all terms to the left:
4c+9-(8c-13)=0
We get rid of parentheses
4c-8c+13+9=0
We add all the numbers together, and all the variables
-4c+22=0
We move all terms containing c to the left, all other terms to the right
-4c=-22
c=-22/-4
c=5+1/2
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