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