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