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5c+5c+2c-2c-6c-12c=-16
We move all terms to the left:
5c+5c+2c-2c-6c-12c-(-16)=0
We add all the numbers together, and all the variables
-8c+16=0
We move all terms containing c to the left, all other terms to the right
-8c=-16
c=-16/-8
c=+2
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