Image:

Your browser's rendering:

A + A + A

Source Code:

    <math> 
      <mrow> 
        <mi>A</mi> 
        <mo>+</mo> 
        <mi>A</mi> 
        <mphantom> 
          <mo>+</mo> 
        </mphantom> 
        <mi>A</mi> 
      </mrow> 
    </math>