Expression 18: "f" left parenthesis, "x" , right parenthesis equals "m" Subscript, 1 , Baseline "x"fx=m1x
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Expression 19: "g" left parenthesis, "x" , right parenthesis equals "m" Subscript, 2 , Baseline left parenthesis, "x" minus "D" Subscript, 1 , Baseline , right parenthesisgx=m2x−D1
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Expression 20: "f" left parenthesis, "L" Subscript, 1 , Baseline , right parenthesis tilde "g" left parenthesis, "L" Subscript, 1 , Baseline , right parenthesisfL1~gL1
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Expression 21: "L" Subscript, 2 , Baseline equals "g" left parenthesis, "L" Subscript, 1 , Baseline , right parenthesisL2=gL1