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n in (-oo:+oo)
(-8/3)*n+21 = (-1/3)*n // - (-1/3)*n
(-8/3)*n-((-1/3)*n)+21 = 0
(-8/3)*n+(1/3)*n+21 = 0
21-7/3*n = 0 // - 21
-7/3*n = -21 // : -7/3
n = -21/(-7/3)
n = 9
n = 9
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