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u in (-oo:+oo)
-((1/5)*u)-5/3 = -1/2 // + -1/2
-((1/5)*u)-5/3-(-1/2) = 0
(-1/5)*u-5/3+1/2 = 0
-1/5*u-7/6 = 0 // + 7/6
-1/5*u = 7/6 // : -1/5
u = 7/6/(-1/5)
u = -35/6
u = -35/6
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