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x in (-oo:+oo)
x/3.4 = 20.8 // - 20.8
x/3.4-20.8 = 0
0.29411765*x-20.8 = 0 // + 20.8
0.29411765*x = 20.8 // : 0.29411765
x = 20.8/0.29411765
x = 70.71999929
x = 70.71999929
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