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d in (-oo:+oo)
2.5*d = 5/4 // - 5/4
2.5*d-(5/4) = 0
2.5*d-5/4 = 0
2.5*d-5/4 = 0 // + 5/4
2.5*d = 5/4 // : 2.5
d = 5/4/2.5
d = 0.5
d = 0.5
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