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15=-4k-9k
We move all terms to the left:
15-(-4k-9k)=0
We add all the numbers together, and all the variables
-(-13k)+15=0
We get rid of parentheses
13k+15=0
We move all terms containing k to the left, all other terms to the right
13k=-15
k=-15/13
k=-1+2/13
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