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n in (-oo:+oo)
5*n-(2*n)-8 = 28 // - 28
5*n-(2*n)-28-8 = 0
5*n-2*n-28-8 = 0
3*n-36 = 0 // + 36
3*n = 36 // : 3
n = 36/3
n = 12
n = 12
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