It is known that 6x+7=49, then 4x+2=how much.
已知6x+7=49，那么4x+2=多少．
<gadget id="calculator">49 - 7</gadget>
<output>42</output>

<gadget id="calculator">42 / 6</gadget>
<output>7</output>

<gadget id="calculator">4 * 7</gadget>
<output>28</output>

<gadget id="calculator">28 + 2</gadget>
<output>30</output>

<result>30</result>