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u in (-oo:+oo)
1/4-((1/5)*u) = -1/3 // + -1/3
1/4-((1/5)*u)-(-1/3) = 0
(-1/5)*u+1/4+1/3 = 0
7/12-1/5*u = 0 // - 7/12
-1/5*u = -7/12 // : -1/5
u = -7/12/(-1/5)
u = 35/12
u = 35/12
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