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n in (-oo:+oo)
4*(5*n+9) = 256 // - 256
4*(5*n+9)-256 = 0
4*(5*n+9)-256 = 0
20*n-220 = 0
20*n-220 = 0
20*n-220 = 0 // + 220
20*n = 220 // : 20
n = 220/20
n = 11
n = 11
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