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n in (-oo:+oo)
(12/20)*n = 36/44 // - 36/44
(12/20)*n-(36/44) = 0
(12/20)*n-9/11 = 0
3/5*n-9/11 = 0 // + 9/11
3/5*n = 9/11 // : 3/5
n = 9/11/3/5
n = 15/11
n = 15/11
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