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n in (-oo:+oo)
4*(3*n+9) = 24 // - 24
4*(3*n+9)-24 = 0
4*(3*n+9)-24 = 0
12*n+12 = 0
12*n+12 = 0
12*n+12 = 0 // - 12
12*n = -12 // : 12
n = -12/12
n = -1
n = -1
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