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13c+8=16c+20
We move all terms to the left:
13c+8-(16c+20)=0
We get rid of parentheses
13c-16c-20+8=0
We add all the numbers together, and all the variables
-3c-12=0
We move all terms containing c to the left, all other terms to the right
-3c=12
c=12/-3
c=-4
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