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-10=-7+2c-c
We move all terms to the left:
-10-(-7+2c-c)=0
We add all the numbers together, and all the variables
-(c-7)-10=0
We get rid of parentheses
-c+7-10=0
We add all the numbers together, and all the variables
-1c-3=0
We move all terms containing c to the left, all other terms to the right
-c=3
c=3/-1
c=-3
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