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999=5c-9
We move all terms to the left:
999-(5c-9)=0
We get rid of parentheses
-5c+9+999=0
We add all the numbers together, and all the variables
-5c+1008=0
We move all terms containing c to the left, all other terms to the right
-5c=-1008
c=-1008/-5
c=201+3/5
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