7=91/x

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Solution for 7=91/x equation: 


D( x )

x = 0

x = 0

x = 0

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

7 = 91/x // - 91/x

7-(91/x) = 0

7-91*x^-1 = 0

-91*x^-1 = -7 // : -91

x^-1 = 1/13

-1 < 0

1/(x^1) = 1/13 // * x^1

1 = 1/13*x^1 // : 1/13

13 = x^1

x = 13

x = 13

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