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u in (-oo:+oo)
2 = 5*u+u-(6/6)+2/3 // - 5*u+u-(6/6)+2/3
6/6-(5*u)-u-(2/3)+2 = 0
6/6-5*u-u-2/3+2 = 0
7/3-6*u = 0 // - 7/3
-6*u = -7/3 // : -6
u = -7/3/(-6)
u = 7/18
u = 7/18
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