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u in (-oo:+oo)
49 = (7/5)*u // - (7/5)*u
49-((7/5)*u) = 0
(-7/5)*u+49 = 0
49-7/5*u = 0 // - 49
-7/5*u = -49 // : -7/5
u = -49/(-7/5)
u = 35
u = 35
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