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n in (-oo:+oo)
0.01*n-(1/5) = 0.009 // - 0.009
0.01*n-(1/5)-0.009 = 0
0.01*n-1/5-0.009 = 0
0.01*n-0.209 = 0 // + 0.209
0.01*n = 0.209 // : 0.01
n = 0.209/0.01
n = 20.9
n = 20.9
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