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d in (-oo:+oo)
((d-4)/4)^2 = 64 // - 64
((d-4)/4)^2-64 = 0
((d-4)^2)/(4^2)-64 = 0
((d-4)^2)/(4^2)+(-64*4^2)/(4^2) = 0
(d-4)^2-64*4^2 = 0
d^2-8*d-1008 = 0
d^2-8*d-1008 = 0
d^2-8*d-1008 = 0
DELTA = (-8)^2-(-1008*1*4)
DELTA = 4096
DELTA > 0
d = (4096^(1/2)+8)/(1*2) or d = (8-4096^(1/2))/(1*2)
d = 36 or d = -28
(d+28)*(d-36) = 0
((d+28)*(d-36))/(4^2) = 0
((d+28)*(d-36))/(4^2) = 0 // * 16
(d+28)*(d-36) = 0
( d+28 )
d+28 = 0 // - 28
d = -28
( d-36 )
d-36 = 0 // + 36
d = 36
d in { -28, 36 }
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