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d in (-oo:+oo)
6-(2*d) = 0-5*d // - 0-5*d
0-(2*d)-(-5*d)+6 = 0
5*d-2*d+6 = 0
3*d+6 = 0 // - 6
3*d = -6 // : 3
d = -6/3
d = -2
d = -2
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