Solve the equation: 9x+3x-2x+12=9x+23.
解方程：9x+3x-2x+12=9x+23．
<gadget id="calculator">23 - 12</gadget>
<output>11</output>

<gadget id="calculator">3 - 2 - 9</gadget>
<output>-8</output>

<gadget id="calculator">9 + (-8)</gadget>
<output>1</output>

<gadget id="calculator">11 / 1</gadget>
<output>11</output>

<result>11</result>