1/4/5=20/x

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Solution for 1/4/5=20/x equation: 


D( x )

x = 0

x = 0

x = 0

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

(1/4)/5 = 20/x // - 20/x

(1/4)/5-(20/x) = 0

(1/4)/5-20*x^-1 = 0

-20*x^-1 = -1/20 // : -20

x^-1 = 1/400

-1 < 0

1/(x^1) = 1/400 // * x^1

1 = 1/400*x^1 // : 1/400

400 = x^1

x = 400

x = 400

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