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n in (-oo:+oo)
3*n+9 = 59-2*n // - 59-2*n
3*n-(-2*n)-59+9 = 0
3*n+2*n-59+9 = 0
5*n-50 = 0 // + 50
5*n = 50 // : 5
n = 50/5
n = 10
n = 10
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