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-10c-9=-9c
We move all terms to the left:
-10c-9-(-9c)=0
We get rid of parentheses
-10c+9c-9=0
We add all the numbers together, and all the variables
-1c-9=0
We move all terms containing c to the left, all other terms to the right
-c=9
c=9/-1
c=-9
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