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d in (-oo:+oo)
3*d-8 = 4*d-16 // - 4*d-16
3*d-(4*d)-8+16 = 0
3*d-4*d-8+16 = 0
8-d = 0 // - 8
-d = -8 // * -1
d = 8
d = 8
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