7/3.5=9/x

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Solution for 7/3.5=9/x equation: 


D( x )

x = 0

x = 0

x = 0

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

7/3.5 = 9/x // - 9/x

7/3.5-(9/x) = 0

7/3.5-9*x^-1 = 0

-9*x^-1 = -2 // : -9

x^-1 = 2/9

-1 < 0

1/(x^1) = 2/9 // * x^1

1 = 2/9*x^1 // : 2/9

9/2 = x^1

x = 9/2

x = 9/2

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