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u in (-oo:+oo)
-10/7 = 2*u // - 2*u
-(2*u)-10/7 = 0
-2*u-10/7 = 0
-2*u-10/7 = 0 // + 10/7
-2*u = 10/7 // : -2
u = 10/7/(-2)
u = -5/7
u = -5/7
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