<!DOCTYPE KTechlab>
<document type="circuit" >
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&lt;p>average of input voltages&lt;/p>
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&lt;p>amplified by 2&lt;/p>
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&lt;p>= sum of input voltages&lt;/p>
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  <data value="15" type="number" id="voltage" />
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  <data value="15" type="number" id="voltage" />
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  <data value="15" type="number" id="voltage" />
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  <data value="1000" type="number" id="resistance" />
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  <data value="1000" type="number" id="resistance" />
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  <data value="10000" type="number" id="resistance" />
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</document>
