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u in (-oo:+oo)
-4/3 = (4/5)*u-(3/2) // - (4/5)*u-(3/2)
3/2-((4/5)*u)-4/3 = 0
(-4/5)*u-4/3+3/2 = 0
1/6-4/5*u = 0 // - 1/6
-4/5*u = -1/6 // : -4/5
u = -1/6/(-4/5)
u = 5/24
u = 5/24
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