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31=4-9c
We move all terms to the left:
31-(4-9c)=0
We add all the numbers together, and all the variables
-(-9c+4)+31=0
We get rid of parentheses
9c-4+31=0
We add all the numbers together, and all the variables
9c+27=0
We move all terms containing c to the left, all other terms to the right
9c=-27
c=-27/9
c=-3
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