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d in (-oo:+oo)
4*d = 3/6 // - 3/6
4*d-(3/6) = 0
4*d-1/2 = 0
4*d-1/2 = 0 // + 1/2
4*d = 1/2 // : 4
d = 1/2/4
d = 1/8
d = 1/8
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