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-8-9c=-7c+10
We move all terms to the left:
-8-9c-(-7c+10)=0
We get rid of parentheses
-9c+7c-10-8=0
We add all the numbers together, and all the variables
-2c-18=0
We move all terms containing c to the left, all other terms to the right
-2c=18
c=18/-2
c=-9
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