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n in (-oo:+oo)
(2/3)*(n-7) = 6 // - 6
(2/3)*(n-7)-6 = 0
2/3*(n-7)-6 = 0
2/3*(n-7)-6 = 0
2/3*n-32/3 = 0
2/3*n-32/3 = 0
2/3*n-32/3 = 0 // + 32/3
2/3*n = 32/3 // : 2/3
n = 32/3/2/3
n = 16
n = 16
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