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u in (-oo:+oo)
-8 = u/5-3 // - u/5-3
3-(u/5)-8 = 0
-1/5*u-5 = 0 // + 5
-1/5*u = 5 // : -1/5
u = 5/(-1/5)
u = -25
u = -25
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