40/x=15/21

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Solution for 40/x=15/21 equation: 


D( x )

x = 0

x = 0

x = 0

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

40/x = 15/21 // - 15/21

40/x-(15/21) = 0

40/x-5/7 = 0

40*x^-1 = 5/7 // : 40

x^-1 = 1/56

-1 < 0

1/(x^1) = 1/56 // * x^1

1 = 1/56*x^1 // : 1/56

56 = x^1

x = 56

x = 56

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