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n in (-oo:+oo)
3-(6*n) = 39 // - 39
3-(6*n)-39 = 0
3-6*n-39 = 0
-6*n-36 = 0 // + 36
-6*n = 36 // : -6
n = 36/(-6)
n = -6
n = -6
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