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a in (-oo:+oo)
77.6/68.1 = a/91.6 // - a/91.6
77.6/68.1-(a/91.6) = 0
77.6/68.1-0.01091703*a = 0
1.13950073-0.01091703*a = 0 // - 1.13950073
-0.01091703*a = -1.13950073 // : -0.01091703
a = -1.13950073/(-0.01091703)
a = 104.3782723
a = 104.3782723
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