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u in (-oo:+oo)
6*u-(3/4) = 9*u-(9/8)+3 // - 9*u-(9/8)+3
6*u-(9*u)-(3/4)+9/8-3 = 0
6*u-9*u-3/4+9/8-3 = 0
-3*u-21/8 = 0 // + 21/8
-3*u = 21/8 // : -3
u = 21/8/(-3)
u = -7/8
u = -7/8
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