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x in (-oo:+oo)
3/9 = x/27 // - x/27
3/9-(x/27) = 0
1/3-1/27*x = 0 // - 1/3
-1/27*x = -1/3 // : -1/27
x = -1/3/(-1/27)
x = 9
x = 9
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