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a in (-oo:+oo)
(5/4)*a+1/2 = 7/9 // - 7/9
(5/4)*a+1/2-(7/9) = 0
(5/4)*a+1/2-7/9 = 0
5/4*a-5/18 = 0 // + 5/18
5/4*a = 5/18 // : 5/4
a = 5/18/5/4
a = 2/9
a = 2/9
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