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n in (-oo:+oo)
3*(5*n-9) = 123 // - 123
3*(5*n-9)-123 = 0
3*(5*n-9)-123 = 0
15*n-150 = 0
15*n-150 = 0
15*n-150 = 0 // + 150
15*n = 150 // : 15
n = 150/15
n = 10
n = 10
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