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-12-4+7.5c-11=-6
We move all terms to the left:
-12-4+7.5c-11-(-6)=0
We add all the numbers together, and all the variables
7.5c-21=0
We move all terms containing c to the left, all other terms to the right
7.5c=21
c=21/7.5
c=2+6/7.5
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