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1200c-15=900c-5
We move all terms to the left:
1200c-15-(900c-5)=0
We get rid of parentheses
1200c-900c+5-15=0
We add all the numbers together, and all the variables
300c-10=0
We move all terms containing c to the left, all other terms to the right
300c=10
c=10/300
c=1/30
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