<math xmlns='http://www.w3.org/1998/Math/MathML'><semantics><mrow xref='id21'><mrow xref='id19'><mrow xref='id9'><mfenced><mrow xref='id3'><mn xref='id1'>1</mn><mo>-</mo><mi xref='id2'>x</mi></mrow></mfenced><mo>⁢</mo><mfenced><mrow xref='id8'><mfrac><mo>ⅆ</mo><mrow><mo>ⅆ</mo><mi xref='id4'>x</mi></mrow></mfrac><mrow xref='id7'><mi xref='id5'>y</mi><mo>⁡</mo><mfenced><mi xref='id6'>x</mi></mfenced></mrow></mrow></mfenced></mrow><mo>+</mo><mrow xref='id18'><mi xref='id10'>x</mi><mo>⁢</mo><mfenced><mrow xref='id17'><mfrac><mo>ⅆ</mo><mrow><mo>ⅆ</mo><mi xref='id11'>x</mi></mrow></mfrac><mrow xref='id16'><mfrac><mo>ⅆ</mo><mrow><mo>ⅆ</mo><mi xref='id12'>x</mi></mrow></mfrac><mrow xref='id15'><mi xref='id13'>y</mi><mo>⁡</mo><mfenced><mi xref='id14'>x</mi></mfenced></mrow></mrow></mrow></mfenced></mrow></mrow><mo>=</mo><mn xref='id20'>0</mn></mrow><annotation-xml encoding='MathML-Content'><apply id='id21'><eq/><apply id='id19'><plus/><apply id='id9'><times/><apply id='id3'><minus/><cn id='id1' type='integer'>1</cn><ci id='id2'>x</ci></apply><apply id='id8'><diff/><bvar><ci id='id4'>x</ci></bvar><apply id='id7'><ci id='id5'>y</ci><ci id='id6'>x</ci></apply></apply></apply><apply id='id18'><times/><ci id='id10'>x</ci><apply id='id17'><diff/><bvar><ci id='id11'>x</ci></bvar><apply id='id16'><diff/><bvar><ci id='id12'>x</ci></bvar><apply id='id15'><ci id='id13'>y</ci><ci id='id14'>x</ci></apply></apply></apply></apply></apply><cn id='id20' type='integer'>0</cn></apply></annotation-xml><annotation encoding='Maple'>(1-x)*diff(y(x),x)+x*diff(diff(y(x),x),x) = 0</annotation></semantics></math>