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d in (-oo:+oo)
56 = d+5*d+2 // - d+5*d+2
56-d-(5*d)-2 = 0
56-d-5*d-2 = 0
54-6*d = 0 // - 54
-6*d = -54 // : -6
d = -54/(-6)
d = 9
d = 9
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