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x in (-oo:+oo)
x/3.1 = -5 // + 5
x/3.1+5 = 0
0.32258065*x+5 = 0 // - 5
0.32258065*x = -5 // : 0.32258065
x = -5/0.32258065
x = -15.49999977
x = -15.49999977
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