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

7/y+4+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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