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-10c=-9c-20
We move all terms to the left:
-10c-(-9c-20)=0
We get rid of parentheses
-10c+9c+20=0
We add all the numbers together, and all the variables
-1c+20=0
We move all terms containing c to the left, all other terms to the right
-c=-20
c=-20/-1
c=+20
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