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a in (-oo:+oo)
21.4 = a/6.3 // - a/6.3
21.4-(a/6.3) = 0
21.4-0.15873016*a = 0
21.4-0.15873016*a = 0 // - 21.4
-0.15873016*a = -21.4 // : -0.15873016
a = -21.4/(-0.15873016)
a = 134.81999892
a = 134.81999892
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