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-12=-7+c
We move all terms to the left:
-12-(-7+c)=0
We add all the numbers together, and all the variables
-(c-7)-12=0
We get rid of parentheses
-c+7-12=0
We add all the numbers together, and all the variables
-1c-5=0
We move all terms containing c to the left, all other terms to the right
-c=5
c=5/-1
c=-5
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