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d in (-oo:+oo)
d-(4*d)-4 = 2 // - 2
d-(4*d)-4-2 = 0
d-4*d-4-2 = 0
-3*d-6 = 0 // + 6
-3*d = 6 // : -3
d = 6/(-3)
d = -2
d = -2
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