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x in (-oo:+oo)
14/18 = x/81 // - x/81
14/18-(x/81) = 0
7/9-1/81*x = 0 // - 7/9
-1/81*x = -7/9 // : -1/81
x = -7/9/(-1/81)
x = 63
x = 63
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