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u in (-oo:+oo)
(-1/2)*u-(3/4) = -8/3 // + -8/3
(-1/2)*u-(3/4)-(-8/3) = 0
(-1/2)*u-3/4+8/3 = 0
23/12-1/2*u = 0 // - 23/12
-1/2*u = -23/12 // : -1/2
u = -23/12/(-1/2)
u = 23/6
u = 23/6
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