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