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15c+6c+15=6+20c
We move all terms to the left:
15c+6c+15-(6+20c)=0
We add all the numbers together, and all the variables
15c+6c-(20c+6)+15=0
We add all the numbers together, and all the variables
21c-(20c+6)+15=0
We get rid of parentheses
21c-20c-6+15=0
We add all the numbers together, and all the variables
c+9=0
We move all terms containing c to the left, all other terms to the right
c=-9
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