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d in (-oo:+oo)
7*d-5 = 103-5*d // - 103-5*d
7*d-(-5*d)-103-5 = 0
7*d+5*d-103-5 = 0
12*d-108 = 0 // + 108
12*d = 108 // : 12
d = 108/12
d = 9
d = 9
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