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6+k/3=-9
We move all terms to the left:
6+k/3-(-9)=0
We add all the numbers together, and all the variables
k/3+15=0
We multiply all the terms by the denominator
k+15*3=0
We add all the numbers together, and all the variables
k+45=0
We move all terms containing k to the left, all other terms to the right
k=-45
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