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