Jenna has a part-time job that pays her \$15 per hour. She worked a total of 5 hours on Monday and 4 hours on Tuesday. She plans to work additional hours on Wednesday to meet her weekly earnings goal of at least \$180. How many hours must Jenna work on Wednesday to meet her goal? Use linear inequalities to solve the problem. Let's think step by step and output the final answer within \boxed{}.
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