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a in (-oo:+oo)
(8/9)*a = 1/6 // - 1/6
(8/9)*a-(1/6) = 0
(8/9)*a-1/6 = 0
8/9*a-1/6 = 0 // + 1/6
8/9*a = 1/6 // : 8/9
a = 1/6/8/9
a = 3/16
a = 3/16
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