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u in (-oo:+oo)
u/6 = 5/2 // - 5/2
u/6-(5/2) = 0
u/6-5/2 = 0
1/6*u-5/2 = 0 // + 5/2
1/6*u = 5/2 // : 1/6
u = 5/2/1/6
u = 15
u = 15
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