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n in (-oo:+oo)
(6*n)/3 = 3*n-9 // - 3*n-9
(6*n)/3-(3*n)+9 = 0
(6*n)/3-3*n+9 = 0
9-n = 0 // - 9
-n = -9 // * -1
n = 9
n = 9
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