Solve the equation: 3x=4*(27-x)+4.
解方程：3x=4*(27-x)+4．
<gadget id="calculator">4 * 27</gadget>
<output>108</output>

<gadget id="calculator">108 + 4</gadget>
<output>112</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">112 / 7</gadget>
<output>16</output>

<result>16</result>