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d in (-oo:+oo)
4*d-4 = 7*d+5 // - 7*d+5
4*d-(7*d)-5-4 = 0
4*d-7*d-5-4 = 0
-3*d-9 = 0 // + 9
-3*d = 9 // : -3
d = 9/(-3)
d = -3
d = -3
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