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10c=7+9c
We move all terms to the left:
10c-(7+9c)=0
We add all the numbers together, and all the variables
10c-(9c+7)=0
We get rid of parentheses
10c-9c-7=0
We add all the numbers together, and all the variables
c-7=0
We move all terms containing c to the left, all other terms to the right
c=7
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