90/x=15/2.1

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Solution for 90/x=15/2.1 equation: 


D( x )

x = 0

x = 0

x = 0

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

90/x = 15/2.1 // - 15/2.1

90/x-(15/2.1) = 0

90/x-7.14285714 = 0

90*x^-1 = 7.14285714 // : 90

x^-1 = 0.07936508

-1 < 0

1/(x^1) = 0.07936508 // * x^1

1 = 0.07936508*x^1 // : 0.07936508

12.5999999 = x^1

x = 12.5999999

x = 12.5999999

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