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x in (-oo:+oo)
2/18 = x/27 // - x/27
2/18-(x/27) = 0
1/9-1/27*x = 0 // - 1/9
-1/27*x = -1/9 // : -1/27
x = -1/9/(-1/27)
x = 3
x = 3
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