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What is kn+4f=9f solve for f

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kn + 4f = 9f
kn + 4f - 4f = 9f - 4f
kn = 5f
kn/5 = 5f/5
kn/5 = f.

f = kn/5 or
f = 1/5 (kn).
User Dimdm
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