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x in (-oo:+oo)
x/21.23 = -3.5 // + 3.5
x/21.23+3.5 = 0
0.04710316*x+3.5 = 0 // - 3.5
0.04710316*x = -3.5 // : 0.04710316
x = -3.5/0.04710316
x = -74.30499355
x = -74.30499355
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