21/18=28/x

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Solution for 21/18=28/x equation: 


D( x )

x = 0

x = 0

x = 0

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

21/18 = 28/x // - 28/x

21/18-(28/x) = 0

21/18-28*x^-1 = 0

-28*x^-1 = -7/6 // : -28

x^-1 = 1/24

-1 < 0

1/(x^1) = 1/24 // * x^1

1 = 1/24*x^1 // : 1/24

24 = x^1

x = 24

x = 24

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