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