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1/f = 1/6 + 1/12
1/f = 2/12 + 1/12
1/f = 3/12
f = 12/3 = 4
**1/f = 1/s + 1/s'
1/4 = 1/7 + 1/s'
1/s' = 1/4 - 1/7
1/s' = (7-4)/28
1/s' = 3/28
s' = 9.3 [d]