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a in (-oo:+oo)
(1/3)*a-(1/2) = 8.01/2 // - 8.01/2
(1/3)*a-(1/2)-(8.01/2) = 0
(1/3)*a-1/2-4.005 = 0
1/3*a-4.505 = 0 // + 4.505
1/3*a = 4.505 // : 1/3
a = 4.505/1/3
a = 13.51500014
a = 13.51500014
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