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u in (-oo:+oo)
1/3-((2/7)*u) = -1/2 // + -1/2
1/3-((2/7)*u)-(-1/2) = 0
(-2/7)*u+1/3+1/2 = 0
5/6-2/7*u = 0 // - 5/6
-2/7*u = -5/6 // : -2/7
u = -5/6/(-2/7)
u = 35/12
u = 35/12
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