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-11=9+10c
We move all terms to the left:
-11-(9+10c)=0
We add all the numbers together, and all the variables
-(10c+9)-11=0
We get rid of parentheses
-10c-9-11=0
We add all the numbers together, and all the variables
-10c-20=0
We move all terms containing c to the left, all other terms to the right
-10c=20
c=20/-10
c=-2
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