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n in (-oo:+oo)
9-(3*n) = 39 // - 39
9-(3*n)-39 = 0
9-3*n-39 = 0
-3*n-30 = 0 // + 30
-3*n = 30 // : -3
n = 30/(-3)
n = -10
n = -10
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