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20+6c=-9(3c-4)
We move all terms to the left:
20+6c-(-9(3c-4))=0
We calculate terms in parentheses: -(-9(3c-4)), so:We get rid of parentheses
-9(3c-4)
We multiply parentheses
-27c+36
Back to the equation:
-(-27c+36)
6c+27c-36+20=0
We add all the numbers together, and all the variables
33c-16=0
We move all terms containing c to the left, all other terms to the right
33c=16
c=16/33
c=16/33
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