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1=-3(91)+c
We move all terms to the left:
1-(-3(91)+c)=0
We add all the numbers together, and all the variables
-(c-391)+1=0
We get rid of parentheses
-c+391+1=0
We add all the numbers together, and all the variables
-1c+392=0
We move all terms containing c to the left, all other terms to the right
-c=-392
c=-392/-1
c=+392
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