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u in (-oo:+oo)
-((1/2)*u)-4/5 = -1/3 // + -1/3
-((1/2)*u)-4/5-(-1/3) = 0
(-1/2)*u-4/5+1/3 = 0
-1/2*u-7/15 = 0 // + 7/15
-1/2*u = 7/15 // : -1/2
u = 7/15/(-1/2)
u = -14/15
u = -14/15
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