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n in (-oo:+oo)
n-(5*n)-4 = 40 // - 40
n-(5*n)-40-4 = 0
n-5*n-40-4 = 0
-4*n-44 = 0 // + 44
-4*n = 44 // : -4
n = 44/(-4)
n = -11
n = -11
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