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7c-8c=-c
We move all terms to the left:
7c-8c-(-c)=0
We add all the numbers together, and all the variables
7c-8c-(-1c)=0
We add all the numbers together, and all the variables
-1c-(-1c)=0
We get rid of parentheses
-1c+1c=0
We add all the numbers together, and all the variables
=0
c=0/1
c=0
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