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15c+9=10c-11
We move all terms to the left:
15c+9-(10c-11)=0
We get rid of parentheses
15c-10c+11+9=0
We add all the numbers together, and all the variables
5c+20=0
We move all terms containing c to the left, all other terms to the right
5c=-20
c=-20/5
c=-4
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