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n in (-oo:+oo)
3*(2*n+1) = -33 // + 33
3*(2*n+1)+33 = 0
3*(2*n+1)+33 = 0
6*n+36 = 0
6*n+36 = 0
6*n+36 = 0 // - 36
6*n = -36 // : 6
n = -36/6
n = -6
n = -6
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