Solve for k
k=\frac{4}{15}\approx 0.266666667
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5k-4+10k=0
Add 10k to both sides.
15k-4=0
Combine 5k and 10k to get 15k.
15k=4
Add 4 to both sides. Anything plus zero gives itself.
k=\frac{4}{15}
Divide both sides by 15.
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