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4+3c=-12-4
We move all terms to the left:
4+3c-(-12-4)=0
We add all the numbers together, and all the variables
3c+4-(-16)=0
We add all the numbers together, and all the variables
3c+20=0
We move all terms containing c to the left, all other terms to the right
3c=-20
c=-20/3
c=-6+2/3
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