4=7/y-5

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Solution for 4=7/y-5 equation: 


D( y )

y = 0

y = 0

y = 0

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

4 = 7/y-5 // - 7/y-5

4-(7/y)+5 = 0

4-7*y^-1+5 = 0

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

y^-1 = 9/7

-1 < 0

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

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

7/9 = y^1

y = 7/9

y = 7/9

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