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d in (-oo:+oo)
6*d+d+1/2 = 127/2 // - 127/2
6*d+d+1/2-(127/2) = 0
6*d+d+1/2-127/2 = 0
7*d-63 = 0 // + 63
7*d = 63 // : 7
d = 63/7
d = 9
d = 9
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