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u in (-oo:+oo)
u/3-26 = -21.8 // + 21.8
u/3-26+21.8 = 0
1/3*u-4.2 = 0 // + 4.2
1/3*u = 4.2 // : 1/3
u = 4.2/1/3
u = 12.60000013
u = 12.60000013
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