15/4=90/k

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Solution for 15/4=90/k equation: 


D( k )

k = 0

k = 0

k = 0

k in (-oo:0) U (0:+oo)

15/4 = 90/k // - 90/k

15/4-(90/k) = 0

15/4-90*k^-1 = 0

-90*k^-1 = -15/4 // : -90

k^-1 = 1/24

-1 < 0

1/(k^1) = 1/24 // * k^1

1 = 1/24*k^1 // : 1/24

24 = k^1

k = 24

k = 24

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