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d in (-oo:+oo)
5/2 = (d-2)/4 // - (d-2)/4
5/2-((d-2)/4) = 0
(-1*(d-2))/4+5/2 = 0
(-1*2*(d-2))/(2*4)+(4*5)/(2*4) = 0
4*5-1*2*(d-2) = 0
24-2*d = 0
(24-2*d)/(2*4) = 0
(24-2*d)/(2*4) = 0 // * 2*4
24-2*d = 0
24-2*d = 0 // - 24
-2*d = -24 // : -2
d = -24/(-2)
d = 12
d = 12
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