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-2c-4+7.5c-11=-6
We move all terms to the left:
-2c-4+7.5c-11-(-6)=0
We add all the numbers together, and all the variables
5.5c-9=0
We move all terms containing c to the left, all other terms to the right
5.5c=9
c=9/5.5
c=1+2.3333333333333/3.6666666666667
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