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X in (-oo:+oo)
X/8 = 4/5 // - 4/5
X/8-(4/5) = 0
X/8-4/5 = 0
1/8*X-4/5 = 0 // + 4/5
1/8*X = 4/5 // : 1/8
X = 4/5/1/8
X = 32/5
X = 32/5
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