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10c-900=5c+1100
We move all terms to the left:
10c-900-(5c+1100)=0
We get rid of parentheses
10c-5c-1100-900=0
We add all the numbers together, and all the variables
5c-2000=0
We move all terms containing c to the left, all other terms to the right
5c=2000
c=2000/5
c=400
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