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-(c+-9)=4
We move all terms to the left:
-(c+-9)-(4)=0
We add all the numbers together, and all the variables
-(c-9)-4=0
We get rid of parentheses
-c+9-4=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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