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u in (-oo:+oo)
u/4-3.1 = -15.9 // + 15.9
u/4-3.1+15.9 = 0
1/4*u+12.8 = 0 // - 12.8
1/4*u = -12.8 // : 1/4
u = -12.8/1/4
u = -51.2
u = -51.2
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