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u in (-oo:+oo)
-((2*u)/3)-(2/7) = 1/2 // - 1/2
-((2*u)/3)-(2/7)-(1/2) = 0
(-2/3)*u-2/7-1/2 = 0
-2/3*u-11/14 = 0 // + 11/14
-2/3*u = 11/14 // : -2/3
u = 11/14/(-2/3)
u = -33/28
u = -33/28
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