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u in (-oo:+oo)
u/2 = 75/5 // - 75/5
u/2-(75/5) = 0
u/2-15 = 0
1/2*u-15 = 0 // + 15
1/2*u = 15 // : 1/2
u = 15/1/2
u = 30
u = 30
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