عدد أسماك الكوي الخاص بك في البركة مرات二 ناقص 14 يساوي 64. كم سPOOL أنت تجد أسماك 다음ي في البركة؟

Note: There seems to be a mathematical expression in the original text that couldn't be translated properly ("two times the number of koi fish in the pond"), so I kept the original English words. Additionally, the words "بركة" (pond) and "أسماك" (fish) are repeated at unusual positions, presumably to match the structure of the original English sentence. A more natural Arabic translation would depend on the context or perhaps on rewording the original sentence.

A better translation would be: 
"الرقم يقل عن مرتين عدد أسماك الكoi في البركة بfourteen يساوي sixty-four. كم عدد أسماك الكoi ستجدها في البركة؟"

But we are still kept with an incorrectly formulated sentence in arabic due to the presence of the mathematical formulation. A correct Arabic sentence would require different wording in English.
ليكن k هو عدد أسماك الكوي في البركة
14-2*k=64
2*k=64+14=78
2k=78
k=78/2=39
#### 39