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d in (-oo:+oo)
d+5 = 49-3*d // - 49-3*d
d-(-3*d)-49+5 = 0
d+3*d-49+5 = 0
4*d-44 = 0 // + 44
4*d = 44 // : 4
d = 44/4
d = 11
d = 11
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