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x in (-oo:+oo)
8/9 = x/4 // - x/4
8/9-(x/4) = 0
8/9-1/4*x = 0 // - 8/9
-1/4*x = -8/9 // : -1/4
x = -8/9/(-1/4)
x = 32/9
x = 32/9
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