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d in (-oo:+oo)
56 = 3*d+2*d+6 // - 3*d+2*d+6
56-(3*d)-(2*d)-6 = 0
56-3*d-2*d-6 = 0
50-5*d = 0 // - 50
-5*d = -50 // : -5
d = -50/(-5)
d = 10
d = 10
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