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d in (-oo:+oo)
(3*d)/4-(1/2) = 0
(3*d)/4-1/2 = 0
3/4*d-1/2 = 0 // + 1/2
3/4*d = 1/2 // : 3/4
d = 1/2/3/4
d = 2/3
d = 2/3
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