4/9=20/X

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Solution for 4/9=20/X equation: 


D( X )

X = 0

X = 0

X = 0

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

4/9 = 20/X // - 20/X

4/9-(20/X) = 0

4/9-20*X^-1 = 0

-20*X^-1 = -4/9 // : -20

X^-1 = 1/45

-1 < 0

1/(X^1) = 1/45 // * X^1

1 = 1/45*X^1 // : 1/45

45 = X^1

X = 45

X = 45

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