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d in (-oo:+oo)
3-5*d = 4*d+12 // - 4*d+12
3-5*d-(4*d)-12 = 0
3-5*d-4*d-12 = 0
-9*d-9 = 0 // + 9
-9*d = 9 // : -9
d = 9/(-9)
d = -1
d = -1
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