21/x=6+9

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Solution for 21/x=6+9 equation: 


D( x )

x = 0

x = 0

x = 0

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

21/x = 6+9 // - 6+9

21/x-9-6 = 0

21*x^-1 = 15 // : 21

x^-1 = 5/7

-1 < 0

1/(x^1) = 5/7 // * x^1

1 = 5/7*x^1 // : 5/7

7/5 = x^1

x = 7/5

x = 7/5

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