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