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3+10c=7+9c
We move all terms to the left:
3+10c-(7+9c)=0
We add all the numbers together, and all the variables
10c-(9c+7)+3=0
We get rid of parentheses
10c-9c-7+3=0
We add all the numbers together, and all the variables
c-4=0
We move all terms containing c to the left, all other terms to the right
c=4
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