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d in (-oo:+oo)
11/2 = 6*d-d+1/2 // - 6*d-d+1/2
d-(6*d)+11/2-(1/2) = 0
d-6*d+11/2-1/2 = 0
5-5*d = 0 // - 5
-5*d = -5 // : -5
d = -5/(-5)
d = 1
d = 1
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