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x in (-oo:+oo)
4/18 = 3*x // - 3*x
4/18-(3*x) = 0
4/18-3*x = 0
2/9-3*x = 0 // - 2/9
-3*x = -2/9 // : -3
x = -2/9/(-3)
x = 2/27
x = 2/27
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