10/40=9/x

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Solution for 10/40=9/x equation: 


D( x )

x = 0

x = 0

x = 0

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

10/40 = 9/x // - 9/x

10/40-(9/x) = 0

10/40-9*x^-1 = 0

-9*x^-1 = -1/4 // : -9

x^-1 = 1/36

-1 < 0

1/(x^1) = 1/36 // * x^1

1 = 1/36*x^1 // : 1/36

36 = x^1

x = 36

x = 36

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