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u in (-oo:+oo)
7*u-(9/5) = 2*u // - 2*u
7*u-(2*u)-(9/5) = 0
7*u-2*u-9/5 = 0
5*u-9/5 = 0 // + 9/5
5*u = 9/5 // : 5
u = 9/5/5
u = 9/25
u = 9/25
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