3=7/y-1

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Solution for 3=7/y-1 equation: 


D( y )

y = 0

y = 0

y = 0

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

3 = 7/y-1 // - 7/y-1

1-(7/y)+3 = 0

1-7*y^-1+3 = 0

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

y^-1 = 4/7

-1 < 0

1/(y^1) = 4/7 // * y^1

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

7/4 = y^1

y = 7/4

y = 7/4

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