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d in (-oo:+oo)
27 = 7*d-2*d+7 // - 7*d-2*d+7
27-(-2*d)-(7*d)-7 = 0
2*d-7*d-7+27 = 0
20-5*d = 0 // - 20
-5*d = -20 // : -5
d = -20/(-5)
d = 4
d = 4
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