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n in (-oo:+oo)
3*(2*n-5) = -81 // + 81
3*(2*n-5)+81 = 0
3*(2*n-5)+81 = 0
6*n+66 = 0
6*n+66 = 0
6*n+66 = 0 // - 66
6*n = -66 // : 6
n = -66/6
n = -11
n = -11
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