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d in (-oo:+oo)
-92 = 4-4*d-(4*d) // - 4-4*d-(4*d)
4*d-(-4*d)-92-4 = 0
4*d+4*d-92-4 = 0
8*d-96 = 0 // + 96
8*d = 96 // : 8
d = 96/8
d = 12
d = 12
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