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u in (-oo:+oo)
14 = (7/5)*u // - (7/5)*u
14-((7/5)*u) = 0
(-7/5)*u+14 = 0
14-7/5*u = 0 // - 14
-7/5*u = -14 // : -7/5
u = -14/(-7/5)
u = 10
u = 10
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