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n in (-oo:+oo)
10-n-(3*n) = 50 // - 50
10-n-(3*n)-50 = 0
10-n-3*n-50 = 0
-4*n-40 = 0 // + 40
-4*n = 40 // : -4
n = 40/(-4)
n = -10
n = -10
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