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u in (-oo:+oo)
3*u = 6/7 // - 6/7
3*u-(6/7) = 0
3*u-6/7 = 0
3*u-6/7 = 0 // + 6/7
3*u = 6/7 // : 3
u = 6/7/3
u = 2/7
u = 2/7
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