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u in (-oo:+oo)
-1/2 = (2/3)*u-(4/7) // - (2/3)*u-(4/7)
4/7-((2/3)*u)-1/2 = 0
(-2/3)*u-1/2+4/7 = 0
1/14-2/3*u = 0 // - 1/14
-2/3*u = -1/14 // : -2/3
u = -1/14/(-2/3)
u = 3/28
u = 3/28
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