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u in (-oo:+oo)
7 = u+5*u-(5/3)-(4/6) // - u+5*u-(5/3)-(4/6)
5/3-u-(5*u)+4/6+7 = 0
5/3-u-5*u+4/6+7 = 0
28/3-6*u = 0 // - 28/3
-6*u = -28/3 // : -6
u = -28/3/(-6)
u = 14/9
u = 14/9
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