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n in (-oo:+oo)
6.4 = n/3.2-0.4 // - n/3.2-0.4
0.4-(n/3.2)+6.4 = 0
0.4-0.3125*n+6.4 = 0
6.8-0.3125*n = 0 // - 6.8
-0.3125*n = -6.8 // : -0.3125
n = -6.8/(-0.3125)
n = 21.76
n = 21.76
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