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x in (-oo:+oo)
12/18 = x/81 // - x/81
12/18-(x/81) = 0
2/3-1/81*x = 0 // - 2/3
-1/81*x = -2/3 // : -1/81
x = -2/3/(-1/81)
x = 54
x = 54
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