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u in (-oo:+oo)
-((1/3)*u)-1/2 = -5/7 // + -5/7
-((1/3)*u)-1/2-(-5/7) = 0
(-1/3)*u-1/2+5/7 = 0
3/14-1/3*u = 0 // - 3/14
-1/3*u = -3/14 // : -1/3
u = -3/14/(-1/3)
u = 9/14
u = 9/14
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