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d in (-oo:+oo)
7*d-6 = 3-2*d // - 3-2*d
7*d-(-2*d)-6-3 = 0
7*d+2*d-6-3 = 0
9*d-9 = 0 // + 9
9*d = 9 // : 9
d = 9/9
d = 1
d = 1
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