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n in (-oo:+oo)
(-4/5)*n = 1/2 // - 1/2
(-4/5)*n-(1/2) = 0
(-4/5)*n-1/2 = 0
-4/5*n-1/2 = 0 // + 1/2
-4/5*n = 1/2 // : -4/5
n = 1/2/(-4/5)
n = -5/8
n = -5/8
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