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n in (-oo:+oo)
-2*n-(3/7) = -23/21 // + -23/21
-2*n-(3/7)-(-23/21) = 0
23/21-2*n-3/7 = 0
2/3-2*n = 0 // - 2/3
-2*n = -2/3 // : -2
n = -2/3/(-2)
n = 1/3
n = 1/3
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