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u in (-oo:+oo)
123-((1/3)*u) = 2 // - 2
123-((1/3)*u)-2 = 0
(-1/3)*u-2+123 = 0
121-1/3*u = 0 // - 121
-1/3*u = -121 // : -1/3
u = -121/(-1/3)
u = 363
u = 363
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