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

4-(-7/y)-5 = 0

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

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

y^-1 = 1/7

-1 < 0

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

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

7 = y^1

y = 7

y = 7

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