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12+8c-3c=-12+3c
We move all terms to the left:
12+8c-3c-(-12+3c)=0
We add all the numbers together, and all the variables
8c-3c-(3c-12)+12=0
We add all the numbers together, and all the variables
5c-(3c-12)+12=0
We get rid of parentheses
5c-3c+12+12=0
We add all the numbers together, and all the variables
2c+24=0
We move all terms containing c to the left, all other terms to the right
2c=-24
c=-24/2
c=-12
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