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X in (-oo:+oo)
X/3.4+6.5 = 15.5 // - 15.5
X/3.4-15.5+6.5 = 0
0.29411765*X-9 = 0 // + 9
0.29411765*X = 9 // : 0.29411765
X = 9/0.29411765
X = 30.59999969
X = 30.59999969
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