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