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n in (-oo:+oo)
93 = 6*n+6*n+9 // - 6*n+6*n+9
93-(6*n)-(6*n)-9 = 0
93-6*n-6*n-9 = 0
84-12*n = 0 // - 84
-12*n = -84 // : -12
n = -84/(-12)
n = 7
n = 7
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