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u in (-oo:+oo)
-1/3 = (5/7)*u-(1/2) // - (5/7)*u-(1/2)
1/2-((5/7)*u)-1/3 = 0
(-5/7)*u-1/3+1/2 = 0
1/6-5/7*u = 0 // - 1/6
-5/7*u = -1/6 // : -5/7
u = -1/6/(-5/7)
u = 7/30
u = 7/30
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