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23=9+4+c
We move all terms to the left:
23-(9+4+c)=0
We add all the numbers together, and all the variables
-(c+13)+23=0
We get rid of parentheses
-c-13+23=0
We add all the numbers together, and all the variables
-1c+10=0
We move all terms containing c to the left, all other terms to the right
-c=-10
c=-10/-1
c=+10
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