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u in (-oo:+oo)
-23 = u-(5*u)-(5/5)-(2/2) // - u-(5*u)-(5/5)-(2/2)
5*u-u+5/5+2/2-23 = 0
4*u-21 = 0 // + 21
4*u = 21 // : 4
u = 21/4
u = 21/4
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