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d in (-oo:+oo)
29 = 6*d-2*d-3 // - 6*d-2*d-3
3-(-2*d)-(6*d)+29 = 0
2*d-6*d+3+29 = 0
32-4*d = 0 // - 32
-4*d = -32 // : -4
d = -32/(-4)
d = 8
d = 8
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