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X in (-oo:+oo)
X/8-4 = 13/16 // - 13/16
X/8-(13/16)-4 = 0
X/8-13/16-4 = 0
1/8*X-77/16 = 0 // + 77/16
1/8*X = 77/16 // : 1/8
X = 77/16/1/8
X = 77/2
X = 77/2
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