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n in (-oo:+oo)
0.4*n-(1/5) = 5 // - 5
0.4*n-(1/5)-5 = 0
0.4*n-1/5-5 = 0
0.4*n-26/5 = 0 // + 26/5
0.4*n = 26/5 // : 0.4
n = 26/5/0.4
n = 13
n = 13
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