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d in (-oo:+oo)
d-8 = 4*d+25 // - 4*d+25
d-(4*d)-25-8 = 0
d-4*d-25-8 = 0
-3*d-33 = 0 // + 33
-3*d = 33 // : -3
d = 33/(-3)
d = -11
d = -11
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