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n in (-oo:+oo)
(11/5)*n = 4*n+20 // - 4*n+20
(11/5)*n-(4*n)-20 = 0
(11/5)*n-4*n-20 = 0
-9/5*n-20 = 0 // + 20
-9/5*n = 20 // : -9/5
n = 20/(-9/5)
n = -100/9
n = -100/9
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