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d in (-oo:+oo)
4*d = 1/4 // - 1/4
4*d-(1/4) = 0
4*d-1/4 = 0
4*d-1/4 = 0 // + 1/4
4*d = 1/4 // : 4
d = 1/4/4
d = 1/16
d = 1/16
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