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-12c-4=-7.5c+5
We move all terms to the left:
-12c-4-(-7.5c+5)=0
We get rid of parentheses
-12c+7.5c-5-4=0
We add all the numbers together, and all the variables
-4.5c-9=0
We move all terms containing c to the left, all other terms to the right
-4.5c=9
c=9/-4.5
c=-2
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