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-k/3=-15
We move all terms to the left:
-k/3-(-15)=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
-1k+45=0
We move all terms containing k to the left, all other terms to the right
-k=-45
k=-45/-1
k=+45
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