4.6 plus 4 times a number, the result is 18.6, what is this number? (List the equation first, then find the solution of the equation)
4.6加上一个数的4倍，结果等于18.6，这个数是多少？(先列方程，再求出方程的解)
<gadget id="calculator">18.6 - 4.6</gadget>
<output>14</output>

<gadget id="calculator">14 / 4</gadget>
<output>7/2 = around 3.5</output>

<result>7/2 = around 3.5</result>