How to lose weight in time for summer?

xoox16
What is the best way to get from 129 to 115. I want to look good in my bathing suit this summer and I don't like how I look now, so I would love to loose 15 pounds in 3-4 weeks ? Is it possible ? And if so, how?
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I'm 5 ft 1
How to lose weight in time for summer?
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