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d in (-oo:+oo)
(5*d)/2 = 987 // - 987
(5*d)/2-987 = 0
5/2*d-987 = 0 // + 987
5/2*d = 987 // : 5/2
d = 987/5/2
d = 1974/5
d = 1974/5
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