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d in (-oo:+oo)
5-(7*d) = 4*d+71 // - 4*d+71
5-(7*d)-(4*d)-71 = 0
5-7*d-4*d-71 = 0
-11*d-66 = 0 // + 66
-11*d = 66 // : -11
d = 66/(-11)
d = -6
d = -6
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