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c*2+15+c=57
We move all terms to the left:
c*2+15+c-(57)=0
We add all the numbers together, and all the variables
c+c*2-42=0
Wy multiply elements
c+2c-42=0
We add all the numbers together, and all the variables
3c-42=0
We move all terms containing c to the left, all other terms to the right
3c=42
c=42/3
c=14
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