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-15-18c=-20c+7
We move all terms to the left:
-15-18c-(-20c+7)=0
We get rid of parentheses
-18c+20c-7-15=0
We add all the numbers together, and all the variables
2c-22=0
We move all terms containing c to the left, all other terms to the right
2c=22
c=22/2
c=11
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