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n in (-oo:+oo)
(9/5)*n = 9/4 // - 9/4
(9/5)*n-(9/4) = 0
(9/5)*n-9/4 = 0
9/5*n-9/4 = 0 // + 9/4
9/5*n = 9/4 // : 9/5
n = 9/4/9/5
n = 5/4
n = 5/4
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