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a in (-oo:+oo)
(5/9)*a-4 = 8.33333 // - 8.33333
(5/9)*a-8.33333-4 = 0
5/9*a-12.33333 = 0 // + 12.33333
5/9*a = 12.33333 // : 5/9
a = 12.33333/5/9
a = 22.19999382
a = 22.19999382
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