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a in (-oo:+oo)
a/15.9 = -1.79235283019 // + 1.79235283019
a/15.9+1.79235283019 = 0
0.06289308*a+1.79235283019 = 0 // - 1.79235283019
0.06289308*a = -1.79235283019 // : 0.06289308
a = -1.79235283019/0.06289308
a = -28.4984108
a = -28.4984108
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