13/15=21/X

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Solution for 13/15=21/X equation: 


D( X )

X = 0

X = 0

X = 0

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

13/15 = 21/X // - 21/X

13/15-(21/X) = 0

13/15-21*X^-1 = 0

-21*X^-1 = -13/15 // : -21

X^-1 = 13/315

-1 < 0

1/(X^1) = 13/315 // * X^1

1 = 13/315*X^1 // : 13/315

315/13 = X^1

X = 315/13

X = 315/13

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