15=420/x

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Solution for 15=420/x equation: 


D( x )

x = 0

x = 0

x = 0

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

15 = 420/x // - 420/x

15-(420/x) = 0

15-420*x^-1 = 0

-420*x^-1 = -15 // : -420

x^-1 = 1/28

-1 < 0

1/(x^1) = 1/28 // * x^1

1 = 1/28*x^1 // : 1/28

28 = x^1

x = 28

x = 28

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