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n in (-oo:+oo)
(-61/2)*n = 8 // - 8
(-61/2)*n-8 = 0
-61/2*n-8 = 0 // + 8
-61/2*n = 8 // : -61/2
n = 8/(-61/2)
n = -16/61
n = -16/61
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