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d in (-oo:+oo)
6*d-6 = 4*d-28 // - 4*d-28
6*d-(4*d)-6+28 = 0
6*d-4*d-6+28 = 0
2*d+22 = 0 // - 22
2*d = -22 // : 2
d = -22/2
d = -11
d = -11
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