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d in (-oo:+oo)
2*d-6 = 30-2*d // - 30-2*d
2*d-(-2*d)-30-6 = 0
2*d+2*d-30-6 = 0
4*d-36 = 0 // + 36
4*d = 36 // : 4
d = 36/4
d = 9
d = 9
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