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n in (-oo:+oo)
(2/3)*(9*n-6) = 4*n+4 // - 4*n+4
(2/3)*(9*n-6)-(4*n)-4 = 0
(2/3)*(9*n-6)-4*n-4 = 0
2/3*(9*n-6)-4*n-4 = 0
2/3*(9*n-6)-4*n-4 = 0
2*n-4-4 = 0
2*n-8 = 0
2*n-8 = 0
2*n-8 = 0 // + 8
2*n = 8 // : 2
n = 8/2
n = 4
n = 4
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