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4c+3=2c-9
We move all terms to the left:
4c+3-(2c-9)=0
We get rid of parentheses
4c-2c+9+3=0
We add all the numbers together, and all the variables
2c+12=0
We move all terms containing c to the left, all other terms to the right
2c=-12
c=-12/2
c=-6
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