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n in (-oo:+oo)
(4/5)*n = 9/1 // - 9/1
(4/5)*n-(9/1) = 0
(4/5)*n-9 = 0
4/5*n-9 = 0 // + 9
4/5*n = 9 // : 4/5
n = 9/4/5
n = 45/4
n = 45/4
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