A 2007 Lexus doesn't use Freon, it uses R134a. If the system is low on R134a, then you really need to find the source of the leak and fix it. A/C coolant is not something you just have to add more of from time to time, it is a sealed system and should never need any added. If it's low, there's a leak, and if all you do is add more it will all just leak out again after a couple months.
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