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-20+2c=-18c+20+20
We move all terms to the left:
-20+2c-(-18c+20+20)=0
We add all the numbers together, and all the variables
2c-(-18c+40)-20=0
We get rid of parentheses
2c+18c-40-20=0
We add all the numbers together, and all the variables
20c-60=0
We move all terms containing c to the left, all other terms to the right
20c=60
c=60/20
c=3
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