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n in (-oo:+oo)
(4/9)*(3*n-3) = 28 // - 28
(4/9)*(3*n-3)-28 = 0
4/9*(3*n-3)-28 = 0
4/9*(3*n-3)-28 = 0
4/3*n-88/3 = 0
4/3*n-88/3 = 0
4/3*n-88/3 = 0 // + 88/3
4/3*n = 88/3 // : 4/3
n = 88/3/4/3
n = 22
n = 22
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