18/90=40/x

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Solution for 18/90=40/x equation: 


D( x )

x = 0

x = 0

x = 0

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

18/90 = 40/x // - 40/x

18/90-(40/x) = 0

18/90-40*x^-1 = 0

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

x^-1 = 1/200

-1 < 0

1/(x^1) = 1/200 // * x^1

1 = 1/200*x^1 // : 1/200

200 = x^1

x = 200

x = 200

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