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n in (-oo:+oo)
2/9-3*n-n = 146/9 // - 146/9
2/9-3*n-n-(146/9) = 0
2/9-3*n-n-146/9 = 0
-4*n-16 = 0 // + 16
-4*n = 16 // : -4
n = 16/(-4)
n = -4
n = -4
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