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