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