4.5/120=0.9/x

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Solution for 4.5/120=0.9/x equation: 


D( x )

x = 0

x = 0

x = 0

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

4.5/120 = 0.9/x // - 0.9/x

4.5/120-(0.9/x) = 0

4.5/120-0.9*x^-1 = 0

-0.9*x^-1 = -0.0375 // : -0.9

x^-1 = 0.04166667

-1 < 0

1/(x^1) = 0.04166667 // * x^1

1 = 0.04166667*x^1 // : 0.04166667

23.99999808 = x^1

x = 23.99999808

x = 23.99999808

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