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n in (-oo:+oo)
4/3 = (4/9)*n+6 // - (4/9)*n+6
4/3-((4/9)*n)-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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