(80/y)-(80/y-2)=(7/y)

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Solution for (80/y)-(80/y-2)=(7/y) equation: 


D( y )

y = 0

y = 0

y = 0

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

80/y-(80/y)+2 = 7/y // - 7/y

80/y-(80/y)-(7/y)+2 = 0

80/y-80*y^-1-7*y^-1+2 = 0

-7*y^-1 = -2 // : -7

y^-1 = 2/7

-1 < 0

1/(y^1) = 2/7 // * y^1

1 = 2/7*y^1 // : 2/7

7/2 = y^1

y = 7/2

y = 7/2

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