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x in (-oo:+oo)
x/3.9 = 0.08/9 // - 0.08/9
x/3.9-(0.08/9) = 0
x/3.9-0.00888889 = 0
0.25641026*x-0.00888889 = 0 // + 0.00888889
0.25641026*x = 0.00888889 // : 0.25641026
x = 0.00888889/0.25641026
x = 0.03466667
x = 0.03466667
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