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n in (-oo:+oo)
5*n-(2*n)-4 = -25 // + 25
5*n-(2*n)-4+25 = 0
5*n-2*n-4+25 = 0
3*n+21 = 0 // - 21
3*n = -21 // : 3
n = -21/3
n = -7
n = -7
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