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u in (-oo:+oo)
-((1/2)*u)-7/5 = -2/3 // + -2/3
-((1/2)*u)-7/5-(-2/3) = 0
(-1/2)*u-7/5+2/3 = 0
-1/2*u-11/15 = 0 // + 11/15
-1/2*u = 11/15 // : -1/2
u = 11/15/(-1/2)
u = -22/15
u = -22/15
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