90/x=15/21

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Solution for 90/x=15/21 equation: 


D( x )

x = 0

x = 0

x = 0

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

90/x = 15/21 // - 15/21

90/x-(15/21) = 0

90/x-5/7 = 0

90*x^-1 = 5/7 // : 90

x^-1 = 1/126

-1 < 0

1/(x^1) = 1/126 // * x^1

1 = 1/126*x^1 // : 1/126

126 = x^1

x = 126

x = 126

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