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n in (-oo:+oo)
-3*n = -15/11 // + -15/11
-3*n-(-15/11) = 0
15/11-3*n = 0
15/11-3*n = 0 // - 15/11
-3*n = -15/11 // : -3
n = -15/11/(-3)
n = 5/11
n = 5/11
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