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n in (-oo:+oo)
6*n-3 = 4*n+9 // - 4*n+9
6*n-(4*n)-9-3 = 0
6*n-4*n-9-3 = 0
2*n-12 = 0 // + 12
2*n = 12 // : 2
n = 12/2
n = 6
n = 6
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