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