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-9=c-(-11)
We move all terms to the left:
-9-(c-(-11))=0
We calculate terms in parentheses: -(c-(-11)), so:We get rid of parentheses
c-(-11)
We add all the numbers together, and all the variables
c+11
Back to the equation:
-(c+11)
-c-11-9=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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