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a in (-oo:+oo)
a/15.9 = -1.7924528 // + 1.7924528
a/15.9+1.7924528 = 0
0.06289308*a+1.7924528 = 0 // - 1.7924528
0.06289308*a = -1.7924528 // : 0.06289308
a = -1.7924528/0.06289308
a = -28.50000032
a = -28.50000032
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