20/45=90/x

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Solution for 20/45=90/x equation: 


D( x )

x = 0

x = 0

x = 0

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

20/45 = 90/x // - 90/x

20/45-(90/x) = 0

20/45-90*x^-1 = 0

-90*x^-1 = -4/9 // : -90

x^-1 = 2/405

-1 < 0

1/(x^1) = 2/405 // * x^1

1 = 2/405*x^1 // : 2/405

405/2 = x^1

x = 405/2

x = 405/2

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