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n in (-oo:+oo)
(-22/3)*n+21 = (-1/3)*n // - (-1/3)*n
(-22/3)*n-((-1/3)*n)+21 = 0
(-22/3)*n+(1/3)*n+21 = 0
21-7*n = 0 // - 21
-7*n = -21 // : -7
n = -21/(-7)
n = 3
n = 3
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