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$\int x=\int x=\int x={\displaystyle \int x=\int x=\int x}$

Source Code:

    <math> 
      <mrow> 
        <mo>&#x0222B;</mo> 
        <mi>x</mi> 
        <mo>=</mo> 
        <mo largeop='true'>&#x0222B;</mo> 
        <mi>x</mi> 
        <mo>=</mo> 
        <mo largeop='false'>&#x0222B;</mo> 
        <mi>x</mi> 
        <mo>=</mo> 
        <mstyle displaystyle='true'> 
          <mo>&#x0222B;</mo> 
          <mi>x</mi> 
          <mo>=</mo> 
          <mo largeop='true'>&#x0222B;</mo> 
          <mi>x</mi> 
          <mo>=</mo> 
          <mo largeop='false'>&#x0222B;</mo> 
          <mi>x</mi> 
        </mstyle> 
      </mrow> 
    </math>