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-3c-4+7c=16+2c
We move all terms to the left:
-3c-4+7c-(16+2c)=0
We add all the numbers together, and all the variables
-3c+7c-(2c+16)-4=0
We add all the numbers together, and all the variables
4c-(2c+16)-4=0
We get rid of parentheses
4c-2c-16-4=0
We add all the numbers together, and all the variables
2c-20=0
We move all terms containing c to the left, all other terms to the right
2c=20
c=20/2
c=10
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