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a in (-oo:+oo)
(4/9)*a+2/9 = 6 // - 6
(4/9)*a+2/9-6 = 0
4/9*a-52/9 = 0 // + 52/9
4/9*a = 52/9 // : 4/9
a = 52/9/4/9
a = 13
a = 13
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