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u in (-oo:+oo)
u/5+4.3 = -8.2 // + 8.2
u/5+4.3+8.2 = 0
1/5*u+12.5 = 0 // - 12.5
1/5*u = -12.5 // : 1/5
u = -12.5/1/5
u = -62.5
u = -62.5
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