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15=-5-4k-2k
We move all terms to the left:
15-(-5-4k-2k)=0
We add all the numbers together, and all the variables
-(-6k-5)+15=0
We get rid of parentheses
6k+5+15=0
We add all the numbers together, and all the variables
6k+20=0
We move all terms containing k to the left, all other terms to the right
6k=-20
k=-20/6
k=-3+1/3
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