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n in (-oo:+oo)
(4/9)*n+6 = 4/3 // - 4/3
(4/9)*n-(4/3)+6 = 0
(4/9)*n-4/3+6 = 0
4/9*n+14/3 = 0 // - 14/3
4/9*n = -14/3 // : 4/9
n = -14/3/4/9
n = -21/2
n = -21/2
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