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n in (-oo:+oo)
-2*n-5 = 3*n-50 // - 3*n-50
50-2*n-(3*n)-5 = 0
50-2*n-3*n-5 = 0
45-5*n = 0 // - 45
-5*n = -45 // : -5
n = -45/(-5)
n = 9
n = 9
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