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d in (-oo:+oo)
d+5 = 7*d-49 // - 7*d-49
d-(7*d)+5+49 = 0
d-7*d+5+49 = 0
54-6*d = 0 // - 54
-6*d = -54 // : -6
d = -54/(-6)
d = 9
d = 9
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