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n in (-oo:+oo)
n/(-5)-55 = 890 // - 890
n/(-5)-890-55 = 0
-1/5*n-945 = 0 // + 945
-1/5*n = 945 // : -1/5
n = 945/(-1/5)
n = -4725
n = -4725
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