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u in (-oo:+oo)
2/3 = 4*u-5 // - 4*u-5
2/3-(4*u)+5 = 0
2/3-4*u+5 = 0
17/3-4*u = 0 // - 17/3
-4*u = -17/3 // : -4
u = -17/3/(-4)
u = 17/12
u = 17/12
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