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a in (-oo:+oo)
a/19.7 = 0.609137055838 // - 0.609137055838
a/19.7-0.609137055838 = 0
0.05076142*a-0.609137055838 = 0 // + 0.609137055838
0.05076142*a = 0.609137055838 // : 0.05076142
a = 0.609137055838/0.05076142
a = 12.00000031
a = 12.00000031
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