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