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x in (-oo:+oo)
(8/2)*x = 12/9 // - 12/9
(8/2)*x-(12/9) = 0
(8/2)*x-4/3 = 0
4*x-4/3 = 0 // + 4/3
4*x = 4/3 // : 4
x = 4/3/4
x = 1/3
x = 1/3
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