Solve the equation: ﹙4.2x+5﹚*1.2=84.
解方程：﹙4.2x+5﹚*1.2=84．
<gadget id="calculator">5 * 1.2</gadget>
<output>6</output>

<gadget id="calculator">84 - 6</gadget>
<output>78</output>

<gadget id="calculator">4.2 * 1.2</gadget>
<output>5.04</output>

<gadget id="calculator">78 / 5.04</gadget>
<output>15.47619</output>

<result>15.47619</result>