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n in (-oo:+oo)
0.8 = n/5 // - n/5
0.8-(n/5) = 0
0.8-1/5*n = 0 // - 0.8
-1/5*n = -0.8 // : -1/5
n = -0.8/(-1/5)
n = 4
n = 4
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