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-9c+7=4c-7
We move all terms to the left:
-9c+7-(4c-7)=0
We get rid of parentheses
-9c-4c+7+7=0
We add all the numbers together, and all the variables
-13c+14=0
We move all terms containing c to the left, all other terms to the right
-13c=-14
c=-14/-13
c=1+1/13
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