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u in (-oo:+oo)
-((1/3)*u)-1/4 = -1/5 // + -1/5
-((1/3)*u)-1/4-(-1/5) = 0
(-1/3)*u-1/4+1/5 = 0
-1/3*u-1/20 = 0 // + 1/20
-1/3*u = 1/20 // : -1/3
u = 1/20/(-1/3)
u = -3/20
u = -3/20
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