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n in (-oo:+oo)
3*(-(2*n)-1) = -39 // + 39
3*(-(2*n)-1)+39 = 0
3*(-2*n-1)+39 = 0
3*(-2*n-1)+39 = 0
36-6*n = 0
36-6*n = 0
36-6*n = 0 // - 36
-6*n = -36 // : -6
n = -36/(-6)
n = 6
n = 6
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