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d in (-oo:+oo)
-194/3 = 2*d+6*d-(2/3) // - 2*d+6*d-(2/3)
2/3-(2*d)-(6*d)-194/3 = 0
2/3-2*d-6*d-194/3 = 0
-8*d-64 = 0 // + 64
-8*d = 64 // : -8
d = 64/(-8)
d = -8
d = -8
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