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d in (-oo:+oo)
d-1 = 5*d-49 // - 5*d-49
d-(5*d)-1+49 = 0
d-5*d-1+49 = 0
48-4*d = 0 // - 48
-4*d = -48 // : -4
d = -48/(-4)
d = 12
d = 12
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