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u in (-oo:+oo)
-8/3 = (2/5)*u-(3/2) // - (2/5)*u-(3/2)
3/2-((2/5)*u)-8/3 = 0
(-2/5)*u-8/3+3/2 = 0
-2/5*u-7/6 = 0 // + 7/6
-2/5*u = 7/6 // : -2/5
u = 7/6/(-2/5)
u = -35/12
u = -35/12
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