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u in (-oo:+oo)
6 = 9*u-u-(7/6)-3+3 // - 9*u-u-(7/6)-3+3
u-(9*u)+7/6-3+3+6 = 0
u-9*u+7/6-3+3+6 = 0
43/6-8*u = 0 // - 43/6
-8*u = -43/6 // : -8
u = -43/6/(-8)
u = 43/48
u = 43/48
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