5=-7/y

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Solution for 5=-7/y equation: 


D( y )

y = 0

y = 0

y = 0

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

5 = -7/y // + -7/y

5-(-7/y) = 0

7*y^-1+5 = 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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