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15=c/2+11
We move all terms to the left:
15-(c/2+11)=0
We get rid of parentheses
-c/2-11+15=0
We multiply all the terms by the denominator
-c-11*2+15*2=0
We add all the numbers together, and all the variables
-1c+8=0
We move all terms containing c to the left, all other terms to the right
-c=-8
c=-8/-1
c=+8
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