30/4=31/X

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Solution for 30/4=31/X equation: 


D( X )

X = 0

X = 0

X = 0

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

30/4 = 31/X // - 31/X

30/4-(31/X) = 0

30/4-31*X^-1 = 0

-31*X^-1 = -15/2 // : -31

X^-1 = 15/62

-1 < 0

1/(X^1) = 15/62 // * X^1

1 = 15/62*X^1 // : 15/62

62/15 = X^1

X = 62/15

X = 62/15

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