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u in (-oo:+oo)
-((1/2)*u)-3/4 = 1/3 // - 1/3
-((1/2)*u)-3/4-(1/3) = 0
(-1/2)*u-3/4-1/3 = 0
-1/2*u-13/12 = 0 // + 13/12
-1/2*u = 13/12 // : -1/2
u = 13/12/(-1/2)
u = -13/6
u = -13/6
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