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n in (-oo:+oo)
(4/5)*n = 9/10 // - 9/10
(4/5)*n-(9/10) = 0
(4/5)*n-9/10 = 0
4/5*n-9/10 = 0 // + 9/10
4/5*n = 9/10 // : 4/5
n = 9/10/4/5
n = 9/8
n = 9/8
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