21/x=7/5

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Solution for 21/x=7/5 equation: 


D( x )

x = 0

x = 0

x = 0

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

21/x = 7/5 // - 7/5

21/x-(7/5) = 0

21/x-7/5 = 0

21*x^-1 = 7/5 // : 21

x^-1 = 1/15

-1 < 0

1/(x^1) = 1/15 // * x^1

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

15 = x^1

x = 15

x = 15

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