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20+12c=30+10c
We move all terms to the left:
20+12c-(30+10c)=0
We add all the numbers together, and all the variables
12c-(10c+30)+20=0
We get rid of parentheses
12c-10c-30+20=0
We add all the numbers together, and all the variables
2c-10=0
We move all terms containing c to the left, all other terms to the right
2c=10
c=10/2
c=5
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