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u in (-oo:+oo)
2/8 = u/12 // - u/12
2/8-(u/12) = 0
1/4-1/12*u = 0 // - 1/4
-1/12*u = -1/4 // : -1/12
u = -1/4/(-1/12)
u = 3
u = 3
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