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