5=-4/y+7

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Solution for 5=-4/y+7 equation: 


D( y )

y = 0

y = 0

y = 0

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

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

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

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

4*y^-1 = 2 // : 4

y^-1 = 1/2

-1 < 0

1/(y^1) = 1/2 // * y^1

1 = 1/2*y^1 // : 1/2

2 = y^1

y = 2

y = 2

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