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x in (-oo:+oo)
(8/12)*x = 4/9 // - 4/9
(8/12)*x-(4/9) = 0
(8/12)*x-4/9 = 0
2/3*x-4/9 = 0 // + 4/9
2/3*x = 4/9 // : 2/3
x = 4/9/2/3
x = 2/3
x = 2/3
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