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X in (-oo:+oo)
X/8-1.2 = 3.1 // - 3.1
X/8-3.1-1.2 = 0
1/8*X-4.3 = 0 // + 4.3
1/8*X = 4.3 // : 1/8
X = 4.3/1/8
X = 34.4
X = 34.4
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