4/y-5/7

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Solution for 4/y-5/7 equation: 


D( y )

y = 0

y = 0

y = 0

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

4/y-(5/7) = 0

4/y-5/7 = 0

4*y^-1 = 5/7 // : 4

y^-1 = 5/28

-1 < 0

1/(y^1) = 5/28 // * y^1

1 = 5/28*y^1 // : 5/28

28/5 = y^1

y = 28/5

y = 28/5

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