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u in (-oo:+oo)
3*u = 15/2 // - 15/2
3*u-(15/2) = 0
3*u-15/2 = 0
3*u-15/2 = 0 // + 15/2
3*u = 15/2 // : 3
u = 15/2/3
u = 5/2
u = 5/2
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