In a fraternity with 31 members, 18 take mathematics, 5 take both mathematics and chemistry , and 8 take neither mathematics nor chemistry . How many take chemistry but not mathematics?

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# In a fraternity with 31 members, 18 take mathematics, 5 take both mathematics and chemistry , and 8 take neither

In a fraternity with 31 members, 18 take mathematics, 5 take both mathematics and chemistry , and 8 take neither mathematics nor chemistry . How many take chemistry but not mathematics?