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7(3c-2)+4(4-c)=0
We add all the numbers together, and all the variables
7(3c-2)+4(-1c+4)=0
We multiply parentheses
21c-4c-14+16=0
We add all the numbers together, and all the variables
17c+2=0
We move all terms containing c to the left, all other terms to the right
17c=-2
c=-2/17
c=-2/17
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