21/x=2.8

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Solution for 21/x=2.8 equation: 


D( x )

x = 0

x = 0

x = 0

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

21/x = 2.8 // - 2.8

21/x-2.8 = 0

21*x^-1 = 2.8 // : 21

x^-1 = 0.13333333

-1 < 0

1/(x^1) = 0.13333333 // * x^1

1 = 0.13333333*x^1 // : 0.13333333

7.50000019 = x^1

x = 7.50000019

x = 7.50000019

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