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k in (-oo:+oo)
ln(225/210) = 10*k // - 10*k
ln(225/210)-(10*k) = 0
ln(225/210)-10*k = 0
ln(15/14)-10*k = 0 // - ln(15/14)
-10*k = -ln(15/14) // : -10
k = -ln(15/14)/(-10)
k = ln(15/14)/10
k = ln(15/14)/10
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