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u in (-oo:+oo)
(2/7)*u-(7/3) = -3/(-2) // + -3/(-2)
(2/7)*u-(7/3)-(-3/(-2)) = 0
(2/7)*u-7/3-3/2 = 0
2/7*u-23/6 = 0 // + 23/6
2/7*u = 23/6 // : 2/7
u = 23/6/2/7
u = 161/12
u = 161/12
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