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