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u in (-oo:+oo)
-1/3 = u+5/6 // - u+5/6
-u-1/3-(5/6) = 0
-u-1/3-5/6 = 0
-u-7/6 = 0 // + 7/6
-u = 7/6 // * -1
u = -7/6
u = -7/6
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