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n in (-oo:+oo)
(-2/3)*n-(91/3) = 2*n // - 2*n
(-2/3)*n-(2*n)-(91/3) = 0
(-2/3)*n-2*n-91/3 = 0
-8/3*n-91/3 = 0 // + 91/3
-8/3*n = 91/3 // : -8/3
n = 91/3/(-8/3)
n = -91/8
n = -91/8
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