4=7/y-1

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Solution for 4=7/y-1 equation: 


D( y )

y = 0

y = 0

y = 0

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

4 = 7/y-1 // - 7/y-1

1-(7/y)+4 = 0

1-7*y^-1+4 = 0

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

y^-1 = 5/7

-1 < 0

1/(y^1) = 5/7 // * y^1

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

7/5 = y^1

y = 7/5

y = 7/5

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