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n in (-oo:+oo)
0.9/0.18 = n/0.012 // - n/0.012
0.9/0.18-(n/0.012) = 0
0.9/0.18-83.33333333*n = 0
5-83.33333333*n = 0 // - 5
-83.33333333*n = -5 // : -83.33333333
n = -5/(-83.33333333)
n = 0.06
n = 0.06
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