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20c+13=-19+18c
We move all terms to the left:
20c+13-(-19+18c)=0
We add all the numbers together, and all the variables
20c-(18c-19)+13=0
We get rid of parentheses
20c-18c+19+13=0
We add all the numbers together, and all the variables
2c+32=0
We move all terms containing c to the left, all other terms to the right
2c=-32
c=-32/2
c=-16
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