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d in (-oo:+oo)
((d-4)/4)^2 = 49 // - 49
((d-4)/4)^2-49 = 0
((d-4)^2)/(4^2)-49 = 0
((d-4)^2)/(4^2)+(-49*4^2)/(4^2) = 0
(d-4)^2-49*4^2 = 0
d^2-8*d-768 = 0
d^2-8*d-768 = 0
d^2-8*d-768 = 0
DELTA = (-8)^2-(-768*1*4)
DELTA = 3136
DELTA > 0
d = (3136^(1/2)+8)/(1*2) or d = (8-3136^(1/2))/(1*2)
d = 32 or d = -24
(d+24)*(d-32) = 0
((d+24)*(d-32))/(4^2) = 0
((d+24)*(d-32))/(4^2) = 0 // * 16
(d+24)*(d-32) = 0
( d+24 )
d+24 = 0 // - 24
d = -24
( d-32 )
d-32 = 0 // + 32
d = 32
d in { -24, 32 }
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