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2/7 = si/so
7si= 2so
si= 2/7 so
i/f= 1/so + 1/si
1/8 = 1/so + 1/(2/7 so)
1/8 = 1/so + 7/2so
1/8 = 2/2so + 7/2so
1/8 = 9/2so
8.9 = 2so
72=2so
so= 72/2 =36 cm