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n in (-oo:+oo)
5*(-1*n-8) = -90 // + 90
5*(-1*n-8)+90 = 0
5*(-n-8)+90 = 0
5*(-n-8)+90 = 0
50-5*n = 0
50-5*n = 0
50-5*n = 0 // - 50
-5*n = -50 // : -5
n = -50/(-5)
n = 10
n = 10
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