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12=3-1c
We move all terms to the left:
12-(3-1c)=0
We add all the numbers together, and all the variables
-(-1c+3)+12=0
We get rid of parentheses
1c-3+12=0
We add all the numbers together, and all the variables
c+9=0
We move all terms containing c to the left, all other terms to the right
c=-9
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