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u in (-oo:+oo)
(-1/2)*u-(3/5) = 1/3 // - 1/3
(-1/2)*u-(3/5)-(1/3) = 0
(-1/2)*u-3/5-1/3 = 0
-1/2*u-14/15 = 0 // + 14/15
-1/2*u = 14/15 // : -1/2
u = 14/15/(-1/2)
u = -28/15
u = -28/15
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