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u in (-oo:+oo)
u/3-2.1 = -11.7 // + 11.7
u/3-2.1+11.7 = 0
1/3*u+9.6 = 0 // - 9.6
1/3*u = -9.6 // : 1/3
u = -9.6/1/3
u = -28.80000029
u = -28.80000029
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