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X in (-oo:+oo)
X/9 = 3.5 // - 3.5
X/9-3.5 = 0
1/9*X-3.5 = 0 // + 3.5
1/9*X = 3.5 // : 1/9
X = 3.5/1/9
X = 31.50000032
X = 31.50000032
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