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u in (-oo:+oo)
-((7/5)*u)-7/2 = 7/3 // - 7/3
-((7/5)*u)-7/2-(7/3) = 0
(-7/5)*u-7/2-7/3 = 0
-7/5*u-35/6 = 0 // + 35/6
-7/5*u = 35/6 // : -7/5
u = 35/6/(-7/5)
u = -25/6
u = -25/6
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