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d in (-oo:+oo)
2*d+7 = 103-6*d // - 103-6*d
2*d-(-6*d)-103+7 = 0
2*d+6*d-103+7 = 0
8*d-96 = 0 // + 96
8*d = 96 // : 8
d = 96/8
d = 12
d = 12
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