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u in (-oo:+oo)
-((1/7)*u)-1/2 = 1/3 // - 1/3
-((1/7)*u)-1/2-(1/3) = 0
(-1/7)*u-1/2-1/3 = 0
-1/7*u-5/6 = 0 // + 5/6
-1/7*u = 5/6 // : -1/7
u = 5/6/(-1/7)
u = -35/6
u = -35/6
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