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a in (-oo:+oo)
(4/9)*a-1 = 13/9 // - 13/9
(4/9)*a-(13/9)-1 = 0
(4/9)*a-13/9-1 = 0
4/9*a-22/9 = 0 // + 22/9
4/9*a = 22/9 // : 4/9
a = 22/9/4/9
a = 11/2
a = 11/2
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