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n in (-oo:+oo)
40 = (-5*n)/8 // - (-5*n)/8
40-((-5*n)/8) = 0
(5/8)*n+40 = 0
5/8*n+40 = 0 // - 40
5/8*n = -40 // : 5/8
n = -40/5/8
n = -64
n = -64
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