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d in (-oo:+oo)
-d-4 = 5-4*d // - 5-4*d
-d-(-4*d)-5-4 = 0
4*d-d-5-4 = 0
3*d-9 = 0 // + 9
3*d = 9 // : 3
d = 9/3
d = 3
d = 3
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