Calculation: 5x+34=7x-42.
计算：5x+34=7x-42．
<gadget id="calculator">34 + 42</gadget>
<output>76</output>

<gadget id="calculator">7 - 5</gadget>
<output>2</output>

<gadget id="calculator">76 / 2</gadget>
<output>38</output>

<result>38</result>