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n in (-oo:+oo)
(5/6)*n+3/5 = 27/20 // - 27/20
(5/6)*n+3/5-(27/20) = 0
(5/6)*n+3/5-27/20 = 0
5/6*n-3/4 = 0 // + 3/4
5/6*n = 3/4 // : 5/6
n = 3/4/5/6
n = 9/10
n = 9/10
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