Solve the equation: 3(x+2)=9.
解方程：3(x+2)=9．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">9 - 6</gadget>
<output>3</output>

<gadget id="calculator">3 / 3</gadget>
<output>1</output>

<result>1</result>