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z in (-oo:+oo)
z*(6-(8*z)-(2/4)) = -z/2-2 // + -z/2-2
z*(6-(8*z)-(2/4))-(-z/2)+2 = 0
z*(6-8*z-1/2)+(1/2)*z+2 = 0
z*(11/2-8*z)+z/2+2 = 0
(2*z*(11/2-8*z))/2+z/2+(2^2)/2 = 0
2*z*(11/2-8*z)+z+4 = 0
12*z-16*z^2+4 = 0
12*z-16*z^2+4 = 0
4*(3*z-4*z^2+1) = 0
3*z-4*z^2+1 = 0
DELTA = 3^2-(-4*1*4)
DELTA = 25
DELTA > 0
z = (25^(1/2)-3)/(-4*2) or z = (-25^(1/2)-3)/(-4*2)
z = -1/4 or z = 1
4*(z+1/4)*(z-1) = 0
(4*(z+1/4)*(z-1))/2 = 0
(4*(z+1/4)*(z-1))/2 = 0 // * 2
4*(z+1/4)*(z-1) = 0
( z+1/4 )
z+1/4 = 0 // - 1/4
z = -1/4
( z-1 )
z-1 = 0 // + 1
z = 1
z in { -1/4, 1 }
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