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8.7k-14=42
We move all terms to the left:
8.7k-14-(42)=0
We add all the numbers together, and all the variables
8.7k-56=0
We move all terms containing k to the left, all other terms to the right
8.7k=56
k=56/8.7
k=6+2.1111111111111/4.8333333333333
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