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u in (-oo:+oo)
5*u+9/3 = 9*u-(8/6)+6 // - 9*u-(8/6)+6
5*u-(9*u)+9/3+8/6-6 = 0
5*u-9*u+9/3+8/6-6 = 0
-4*u-5/3 = 0 // + 5/3
-4*u = 5/3 // : -4
u = 5/3/(-4)
u = -5/12
u = -5/12
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