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n in (-oo:+oo)
(1/3)*(2*n-7) = 4 // - 4
(1/3)*(2*n-7)-4 = 0
1/3*(2*n-7)-4 = 0
1/3*(2*n-7)-4 = 0
2/3*n-19/3 = 0
2/3*n-19/3 = 0
2/3*n-19/3 = 0 // + 19/3
2/3*n = 19/3 // : 2/3
n = 19/3/2/3
n = 19/2
n = 19/2
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