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u in (-oo:+oo)
u/4-3.5 = -9.9 // + 9.9
u/4-3.5+9.9 = 0
1/4*u+6.4 = 0 // - 6.4
1/4*u = -6.4 // : 1/4
u = -6.4/1/4
u = -25.6
u = -25.6
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