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n in (-oo:+oo)
(2/3)*n-6 = 3 // - 3
(2/3)*n-6-3 = 0
2/3*n-9 = 0 // + 9
2/3*n = 9 // : 2/3
n = 9/2/3
n = 27/2
n = 27/2
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