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a in (-oo:+oo)
(3/8)*a = 4/9 // - 4/9
(3/8)*a-(4/9) = 0
(3/8)*a-4/9 = 0
3/8*a-4/9 = 0 // + 4/9
3/8*a = 4/9 // : 3/8
a = 4/9/3/8
a = 32/27
a = 32/27
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