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9c=10c-4
We move all terms to the left:
9c-(10c-4)=0
We get rid of parentheses
9c-10c+4=0
We add all the numbers together, and all the variables
-1c+4=0
We move all terms containing c to the left, all other terms to the right
-c=-4
c=-4/-1
c=+4
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