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x in (-oo:+oo)
12/11-(-2/3) = x // - x
12/11-x-(-2/3) = 0
12/11-x+2/3 = 0
58/33-x = 0 // - 58/33
-x = -58/33 // * -1
x = 58/33
x = 58/33
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