15=105/y

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Solution for 15=105/y equation: 


D( y )

y = 0

y = 0

y = 0

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

15 = 105/y // - 105/y

15-(105/y) = 0

15-105*y^-1 = 0

-105*y^-1 = -15 // : -105

y^-1 = 1/7

-1 < 0

1/(y^1) = 1/7 // * y^1

1 = 1/7*y^1 // : 1/7

7 = y^1

y = 7

y = 7

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