7/40=25/x

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Solution for 7/40=25/x equation: 


D( x )

x = 0

x = 0

x = 0

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

7/40 = 25/x // - 25/x

7/40-(25/x) = 0

7/40-25*x^-1 = 0

-25*x^-1 = -7/40 // : -25

x^-1 = 7/1000

-1 < 0

1/(x^1) = 7/1000 // * x^1

1 = 7/1000*x^1 // : 7/1000

1000/7 = x^1

x = 1000/7

x = 1000/7

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