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n in (-oo:+oo)
n/3 = 5*n-42 // - 5*n-42
n/3-(5*n)+42 = 0
n/3-5*n+42 = 0
42-14/3*n = 0 // - 42
-14/3*n = -42 // : -14/3
n = -42/(-14/3)
n = 9
n = 9
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