18=20/Y-2Y

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Solution for 18=20/Y-2Y equation: 


D( Y )

Y = 0

Y = 0

Y = 0

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

18 = 20/Y-(2*Y) // - 20/Y-(2*Y)

2*Y-(20/Y)+18 = 0

2*Y-20*Y^-1+18 = 0

2*Y^1-20*Y^-1+18*Y^0 = 0

(2*Y^2+18*Y^1-20*Y^0)/(Y^1) = 0 // * Y^2

Y^1*(2*Y^2+18*Y^1-20*Y^0) = 0

Y^1

2*Y^2+18*Y-20 = 0

2*Y^2+18*Y-20 = 0

DELTA = 18^2-(-20*2*4)

DELTA = 484

DELTA > 0

Y = (484^(1/2)-18)/(2*2) or Y = (-484^(1/2)-18)/(2*2)

Y = 1 or Y = -10

Y in { -10, 1} 

Y in { -10, 1 }

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