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u in (-oo:+oo)
(-1/5)*u-(1/2) = 1/3 // - 1/3
(-1/5)*u-(1/2)-(1/3) = 0
(-1/5)*u-1/2-1/3 = 0
-1/5*u-5/6 = 0 // + 5/6
-1/5*u = 5/6 // : -1/5
u = 5/6/(-1/5)
u = -25/6
u = -25/6
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