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Theodore has 20 baseball cards. He sells \(\frac{\mathrm{1} }{\mathrm{4}}\) of his cards to Tom, \(\frac{\mathrm{1} }{\mathrm{3}}\) of his cards to Larry, and his Mom accidently throws away \(\frac{\mathrm{1} }{\mathrm{6}}\) of his cards. How many baseball cards does Theodore have left?