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How to avoide or reduce taxes on property sale? - land for sale eastern shore maryland

I want a property in Eastern Washington (not my main house) is just an empty piece of land. I bought for $ 34,000 and now I'm looking to sell for about $ 155,000 to continue his studies. I know who does not own other property, and I use for teaching can reduce capital gains in it and what percentage would be my capital gain taxes will be? Well, I'm only about $ 13,000 a year with my part time job. Thanks