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x in (-oo:+oo)
84/11 = x/231 // - x/231
84/11-(x/231) = 0
84/11-1/231*x = 0 // - 84/11
-1/231*x = -84/11 // : -1/231
x = -84/11/(-1/231)
x = 1764
x = 1764
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