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-(-1-2)=c
We move all terms to the left:
-(-1-2)-(c)=0
We add all the numbers together, and all the variables
-c-(-3)=0
We add all the numbers together, and all the variables
-1c+3=0
We move all terms containing c to the left, all other terms to the right
-c=-3
c=-3/-1
c=+3
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