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