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u in (-oo:+oo)
-9/7 = (1/2)*u-2/3 // - (1/2)*u-2/3
-((1/2)*u)-9/7-(-2/3) = 0
(-1/2)*u-9/7+2/3 = 0
-1/2*u-13/21 = 0 // + 13/21
-1/2*u = 13/21 // : -1/2
u = 13/21/(-1/2)
u = -26/21
u = -26/21
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