A function fsatisfies and . A function gsatisfies and . What is the value of ?

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A function fsatisfies <img alt='images' src='https://www.fatskills.com/images2/SAT/eq04260.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mi>f</m:mi><m:mfenced open='(' close=')'><m:mrow><m:mn>4</m:mn></m:mrow></m:mfenced><m:mo>=</m:mo><m:mn>7</m:mn></m:mrow></m:math>--> and <img alt='images' src='https://www.fatskills.com/images2/SAT/eq04261.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mi>f</m:mi><m:mfenced open='(' close=')'><m:mrow><m:mn>9</m:mn></m:mrow></m:mfenced><m:mo>=</m:mo><m:mn>13</m:mn></m:mrow></m:math>-->. A function gsatisfies <img alt='images' src='https://www.fatskills.com/images2/SAT/eq04262.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mi>g</m:mi><m:mfenced open='(' close=')'><m:mrow><m:mn>7</m:mn></m:mrow></m:mfenced><m:mo>=</m:mo><m:mn>12</m:mn></m:mrow></m:math>--> and <img alt='images' src='https://www.fatskills.com/images2/SAT/eq04263.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mi>g</m:mi><m:mfenced open='(' close=')'><m:mrow><m:mn>9</m:mn></m:mrow></m:mfenced><m:mo>=</m:mo><m:mn>14</m:mn></m:mrow></m:math>-->. What is the value of <img alt='images' src='https://www.fatskills.com/images2/SAT/eq04264.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mi>g</m:mi><m:mfenced open='(' close=')'><m:mrow><m:mrow><m:mi>f</m:mi><m:mfenced open='(' close=')'><m:mrow><m:mn>4</m:mn></m:mrow></m:mfenced></m:mrow></m:mrow></m:mfenced></m:mrow></m:math>-->?