10/y-10/y-7=9/y

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Solution for 10/y-10/y-7=9/y equation: 


D( y )

y = 0

y = 0

y = 0

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

10/y-(10/y)-7 = 9/y // - 9/y

10/y-(10/y)-(9/y)-7 = 0

10/y-10*y^-1-9*y^-1-7 = 0

-9*y^-1 = 7 // : -9

y^-1 = -7/9

-1 < 0

1/(y^1) = -7/9 // * y^1

1 = -7/9*y^1 // : -7/9

-9/7 = y^1

y = -9/7

y = -9/7

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