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n in (-oo:+oo)
(2/3)*(n-6) = 5*n-43 // - 5*n-43
(2/3)*(n-6)-(5*n)+43 = 0
(2/3)*(n-6)-5*n+43 = 0
2/3*(n-6)-5*n+43 = 0
2/3*(n-6)-5*n+43 = 0
43-13/3*n-4 = 0
39-13/3*n = 0
39-13/3*n = 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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