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9c+390=14c+240
We move all terms to the left:
9c+390-(14c+240)=0
We get rid of parentheses
9c-14c-240+390=0
We add all the numbers together, and all the variables
-5c+150=0
We move all terms containing c to the left, all other terms to the right
-5c=-150
c=-150/-5
c=+30
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