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d in (-oo:+oo)
79 = 7-4*d-(4*d) // - 7-4*d-(4*d)
4*d-(-4*d)-7+79 = 0
4*d+4*d-7+79 = 0
8*d+72 = 0 // - 72
8*d = -72 // : 8
d = -72/8
d = -9
d = -9
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