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13=4+c
We move all terms to the left:
13-(4+c)=0
We add all the numbers together, and all the variables
-(c+4)+13=0
We get rid of parentheses
-c-4+13=0
We add all the numbers together, and all the variables
-1c+9=0
We move all terms containing c to the left, all other terms to the right
-c=-9
c=-9/-1
c=+9
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