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-7=c/2+5
We move all terms to the left:
-7-(c/2+5)=0
We get rid of parentheses
-c/2-5-7=0
We multiply all the terms by the denominator
-c-5*2-7*2=0
We add all the numbers together, and all the variables
-1c-24=0
We move all terms containing c to the left, all other terms to the right
-c=24
c=24/-1
c=-24
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