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x in (-oo:+oo)
5/6-x = 2/1 // - 2/1
5/6-x-(2/1) = 0
5/6-x-2 = 0
-x-7/6 = 0 // + 7/6
-x = 7/6 // * -1
x = -7/6
x = -7/6
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