23=15+1/y

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Solution for 23=15+1/y equation: 


D( y )

y = 0

y = 0

y = 0

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

23 = 1/y+15 // - 1/y+15

23-(1/y)-15 = 0

23-y^-1-15 = 0

-1*y^-1 = -8 // : -1

y^-1 = 8

-1 < 0

1/(y^1) = 8 // * y^1

1 = 8*y^1 // : 8

1/8 = y^1

y = 1/8

y = 1/8

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