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u in (-oo:+oo)
-2/3 = (1/2)*u-(9/5) // - (1/2)*u-(9/5)
9/5-((1/2)*u)-2/3 = 0
(-1/2)*u-2/3+9/5 = 0
17/15-1/2*u = 0 // - 17/15
-1/2*u = -17/15 // : -1/2
u = -17/15/(-1/2)
u = 34/15
u = 34/15
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