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d in (-oo:+oo)
d-7 = 4*d-34 // - 4*d-34
d-(4*d)-7+34 = 0
d-4*d-7+34 = 0
27-3*d = 0 // - 27
-3*d = -27 // : -3
d = -27/(-3)
d = 9
d = 9
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