25/40=5/x

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Solution for 25/40=5/x equation: 


D( x )

x = 0

x = 0

x = 0

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

25/40 = 5/x // - 5/x

25/40-(5/x) = 0

25/40-5*x^-1 = 0

-5*x^-1 = -5/8 // : -5

x^-1 = 1/8

-1 < 0

1/(x^1) = 1/8 // * x^1

1 = 1/8*x^1 // : 1/8

8 = x^1

x = 8

x = 8

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