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n in (-oo:+oo)
4*n = 7*n-(15/3) // - 7*n-(15/3)
4*n-(7*n)+15/3 = 0
4*n-7*n+15/3 = 0
5-3*n = 0 // - 5
-3*n = -5 // : -3
n = -5/(-3)
n = 5/3
n = 5/3
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