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u in (-oo:+oo)
-((2/3)*u)-9/5 = -1/2 // + -1/2
-((2/3)*u)-9/5-(-1/2) = 0
(-2/3)*u-9/5+1/2 = 0
-2/3*u-13/10 = 0 // + 13/10
-2/3*u = 13/10 // : -2/3
u = 13/10/(-2/3)
u = -39/20
u = -39/20
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