y-12/y=1

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Solution for y-12/y=1 equation: 


D( y )

y = 0

y = 0

y = 0

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

y-(12/y) = 1 // - 1

y-(12/y)-1 = 0

y-12*y^-1-1 = 0

1*y^1-12*y^-1-1*y^0 = 0

(1*y^2-1*y^1-12*y^0)/(y^1) = 0 // * y^2

y^1*(1*y^2-1*y^1-12*y^0) = 0

y^1

y^2-y-12 = 0

y^2-y-12 = 0

DELTA = (-1)^2-(-12*1*4)

DELTA = 49

DELTA > 0

y = (49^(1/2)+1)/(1*2) or y = (1-49^(1/2))/(1*2)

y = 4 or y = -3

y in { -3, 4} 

y in { -3, 4 }

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