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n in (-oo:+oo)
(2/3)*n-4 = 5*n-43 // - 5*n-43
(2/3)*n-(5*n)-4+43 = 0
(2/3)*n-5*n-4+43 = 0
39-13/3*n = 0 // - 39
-13/3*n = -39 // : -13/3
n = -39/(-13/3)
n = 9
n = 9
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