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n in (-oo:+oo)
4/5-3*n = 7*n-(596/5) // - 7*n-(596/5)
4/5-3*n-(7*n)+596/5 = 0
4/5-3*n-7*n+596/5 = 0
120-10*n = 0 // - 120
-10*n = -120 // : -10
n = -120/(-10)
n = 12
n = 12
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