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x in (-oo:+oo)
2/3 = x/9 // - x/9
2/3-(x/9) = 0
2/3-1/9*x = 0 // - 2/3
-1/9*x = -2/3 // : -1/9
x = -2/3/(-1/9)
x = 6
x = 6
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