No trick. Just keep adding 7. 7,14,21,28....
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7,17,27,37,47,57,67,70,71,72,73,74,75,76,77(two sevens),78,79,87,97=20 times
Puto
Expressed algebraically, this would equal 7s - 5.
7s + 12 = 131 Therefore, 7s = 119 s = 119/7 Therefore, s = 17
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