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x in (-oo:+oo)
-12/23 = x+9/23 // - x+9/23
-x-12/23-(9/23) = 0
-x-12/23-9/23 = 0
-x-21/23 = 0 // + 21/23
-x = 21/23 // * -1
x = -21/23
x = -21/23
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