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x in (-oo:+oo)
(4/9)*x = 16/27 // - 16/27
(4/9)*x-(16/27) = 0
(4/9)*x-16/27 = 0
4/9*x-16/27 = 0 // + 16/27
4/9*x = 16/27 // : 4/9
x = 16/27/4/9
x = 4/3
x = 4/3
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