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162 = - 6 + 7(n - 1)
168 = 7n - 7
7n = 175
n = 175/7 = 25
162 = - 6 + (n - 1)7
162 + 6 = (n-1)7
168 = 7(n-1)
n - 1 = 168 : 7 = 24
n = 24 + 1 = 25