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n in (-oo:+oo)
2-(3*n) = 3*n-40 // - 3*n-40
2-(3*n)-(3*n)+40 = 0
2-3*n-3*n+40 = 0
42-6*n = 0 // - 42
-6*n = -42 // : -6
n = -42/(-6)
n = 7
n = 7
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