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12=k/2-(-9)
We move all terms to the left:
12-(k/2-(-9))=0
We multiply all the terms by the denominator
-(k+12*2-(-9))=0
We calculate terms in parentheses: -(k+12*2-(-9)), so:We get rid of parentheses
k+12*2-(-9)
We add all the numbers together, and all the variables
k+33
Back to the equation:
-(k+33)
-k-33=0
We add all the numbers together, and all the variables
-1k-33=0
We move all terms containing k to the left, all other terms to the right
-k=33
k=33/-1
k=-33
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