Expression 17: "f" left parenthesis, "x" , right parenthesis equals "x"fx=x
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Expression 18: "g" left parenthesis, "x" , right parenthesis equals "m" Subscript, 1 , Baseline left parenthesis, "x" minus "D" Subscript, 1 , Baseline , right parenthesisgx=m1x−D1
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Expression 19: "f" left parenthesis, "E" Subscript, 1 , Baseline , right parenthesis tilde "g" left parenthesis, "E" Subscript, 1 , Baseline , right parenthesisfE1~gE1
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Expression 20: "E" Subscript, 2 , Baseline equals "g" left parenthesis, "E" Subscript, 1 , Baseline , right parenthesisE2=gE1