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8c-4c=-47+27
We move all terms to the left:
8c-4c-(-47+27)=0
We add all the numbers together, and all the variables
8c-4c-(-20)=0
We add all the numbers together, and all the variables
4c+20=0
We move all terms containing c to the left, all other terms to the right
4c=-20
c=-20/4
c=-5
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