4/5y+7/y=1

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Solution for 4/5y+7/y=1 equation: 


D( y )

y = 0

y = 0

y = 0

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

(4/5)*y+7/y = 1 // - 1

(4/5)*y+7/y-1 = 0

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

(4/5*y^2-1*y^1+7*y^0)/(y^1) = 0 // * y^2

y^1*(4/5*y^2-1*y^1+7*y^0) = 0

y^1

(4/5)*y^2-y+7 = 0

(4/5)*y^2-y+7 = 0

DELTA = (-1)^2-(4*7*(4/5))

DELTA = -107/5

DELTA < 0

y in { } 

y belongs to the empty set

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