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u in (-oo:+oo)
u/5 = -61/2 // + -61/2
u/5-(-61/2) = 0
u/5+61/2 = 0
1/5*u+61/2 = 0 // - 61/2
1/5*u = -61/2 // : 1/5
u = -61/2/1/5
u = -305/2
u = -305/2
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