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n in (-oo:+oo)
-3*n = -18/11 // + -18/11
-3*n-(-18/11) = 0
18/11-3*n = 0
18/11-3*n = 0 // - 18/11
-3*n = -18/11 // : -3
n = -18/11/(-3)
n = 6/11
n = 6/11
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