What is the solution of the equation 15*2+3x=42 is x=
方程式15*2+3x=42的解是x=多少
<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">42 - 30</gadget>
<output>12</output>

<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<result>4</result>