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-10c-9=-7c+9
We move all terms to the left:
-10c-9-(-7c+9)=0
We get rid of parentheses
-10c+7c-9-9=0
We add all the numbers together, and all the variables
-3c-18=0
We move all terms containing c to the left, all other terms to the right
-3c=18
c=18/-3
c=-6
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