20/2=40/x

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Solution for 20/2=40/x equation: 


D( x )

x = 0

x = 0

x = 0

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

20/2 = 40/x // - 40/x

20/2-(40/x) = 0

20/2-40*x^-1 = 0

-40*x^-1 = -10 // : -40

x^-1 = 1/4

-1 < 0

1/(x^1) = 1/4 // * x^1

1 = 1/4*x^1 // : 1/4

4 = x^1

x = 4

x = 4

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