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u in (-oo:+oo)
1/3 = u+5/6 // - u+5/6
1/3-u-(5/6) = 0
1/3-u-5/6 = 0
-u-1/2 = 0 // + 1/2
-u = 1/2 // * -1
u = -1/2
u = -1/2
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