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-7c-2.5-2c=16.5
We move all terms to the left:
-7c-2.5-2c-(16.5)=0
We add all the numbers together, and all the variables
-9c-19=0
We move all terms containing c to the left, all other terms to the right
-9c=19
c=19/-9
c=-2+1/9
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