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