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n in (-oo:+oo)
5*n+9 = 3*n-15 // - 3*n-15
5*n-(3*n)+9+15 = 0
5*n-3*n+9+15 = 0
2*n+24 = 0 // - 24
2*n = -24 // : 2
n = -24/2
n = -12
n = -12
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