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2(n - 11)
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twice the difference of three times a number and eight
2x-16
It is 3*n - 5
L = S + 11; 2S + 3(S + 11) = 123, ie 2S + 3S + 33 = 123ie 5S = 90 ie S = 18 and L = 29
47 Impossible problem!