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n in (-oo:+oo)
6*n+9 = 4*n+19 // - 4*n+19
6*n-(4*n)-19+9 = 0
6*n-4*n-19+9 = 0
2*n-10 = 0 // + 10
2*n = 10 // : 2
n = 10/2
n = 5
n = 5
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