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n in (-oo:+oo)
4/5-(1/5) = (2/5)*n // - (2/5)*n
4/5-((2/5)*n)-(1/5) = 0
(-2/5)*n+4/5-1/5 = 0
3/5-2/5*n = 0 // - 3/5
-2/5*n = -3/5 // : -2/5
n = -3/5/(-2/5)
n = 3/2
n = 3/2
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