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d in (-oo:+oo)
-6 = 7*d-2*d+4 // - 7*d-2*d+4
-(-2*d)-(7*d)-6-4 = 0
2*d-7*d-6-4 = 0
-5*d-10 = 0 // + 10
-5*d = 10 // : -5
d = 10/(-5)
d = -2
d = -2
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