3/13=7/x

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Solution for 3/13=7/x equation: 


D( x )

x = 0

x = 0

x = 0

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

3/13 = 7/x // - 7/x

3/13-(7/x) = 0

3/13-7*x^-1 = 0

-7*x^-1 = -3/13 // : -7

x^-1 = 3/91

-1 < 0

1/(x^1) = 3/91 // * x^1

1 = 3/91*x^1 // : 3/91

91/3 = x^1

x = 91/3

x = 91/3

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