-x-81/x-6=12

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Solution for -x-81/x-6=12 equation: 


D( x )

x = 0

x = 0

x = 0

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

-x-(81/x)-6 = 12 // - 12

-x-(81/x)-12-6 = 0

-x-81*x^-1-12-6 = 0

-1*x^1-81*x^-1-18*x^0 = 0

(-1*x^2-18*x^1-81*x^0)/(x^1) = 0 // * x^2

x^1*(-1*x^2-18*x^1-81*x^0) = 0

x^1

-x^2-18*x-81 = 0

-x^2-18*x-81 = 0

DELTA = (-18)^2-(-81*(-1)*4)

DELTA = 0

x = 18/(-1*2)

x = -9 or x = -9

x in { -9, -9} 

x in { -9, -9 }

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