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n in (-oo:+oo)
-4*n-5 = -20/3 // + -20/3
-4*n-(-20/3)-5 = 0
20/3-4*n-5 = 0
5/3-4*n = 0 // - 5/3
-4*n = -5/3 // : -4
n = -5/3/(-4)
n = 5/12
n = 5/12
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