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-18c-6=-20c
We move all terms to the left:
-18c-6-(-20c)=0
We get rid of parentheses
-18c+20c-6=0
We add all the numbers together, and all the variables
2c-6=0
We move all terms containing c to the left, all other terms to the right
2c=6
c=6/2
c=3
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