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3c+2=2-4c+=-21
We move all terms to the left:
3c+2-(2-4c+)=0
We add all the numbers together, and all the variables
3c-(-4c)+2=0
We get rid of parentheses
3c+4c+2=0
We add all the numbers together, and all the variables
7c+2=0
We move all terms containing c to the left, all other terms to the right
7c=-2
c=-2/7
c=-2/7
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