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n in (-oo:+oo)
(-8/3)*n-(2*n) = 7 // - 7
(-8/3)*n-(2*n)-7 = 0
(-8/3)*n-2*n-7 = 0
-14/3*n-7 = 0 // + 7
-14/3*n = 7 // : -14/3
n = 7/(-14/3)
n = -3/2
n = -3/2
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