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u in (-oo:+oo)
-1/4 = (1/5)*u-(2/3) // - (1/5)*u-(2/3)
2/3-((1/5)*u)-1/4 = 0
(-1/5)*u-1/4+2/3 = 0
5/12-1/5*u = 0 // - 5/12
-1/5*u = -5/12 // : -1/5
u = -5/12/(-1/5)
u = 25/12
u = 25/12
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