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d in (-oo:+oo)
d/4 = 2.375 // - 2.375
d/4-2.375 = 0
1/4*d-2.375 = 0 // + 2.375
1/4*d = 2.375 // : 1/4
d = 2.375/1/4
d = 9.5
d = 9.5
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