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0.3(9k+12)=15
We move all terms to the left:
0.3(9k+12)-(15)=0
We multiply parentheses
2.7k+3.6-15=0
We add all the numbers together, and all the variables
2.7k-11.4=0
We move all terms containing k to the left, all other terms to the right
2.7k=11.4
k=11.4/2.7
k=4+0.6/2.7
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