It is known that 3x+2.5=12.1, so how much is 6x+2.5=
已知3x+2.5=12.1，那么6x+2.5=多少
<gadget id="calculator">12.1 - 2.5</gadget>
<output>9.6</output>

<gadget id="calculator">9.6 / 3</gadget>
<output>3.2</output>

<gadget id="calculator">6 * 3.2</gadget>
<output>19.2</output>

<gadget id="calculator">19.2 + 2.5</gadget>
<output>21.7</output>

<result>21.7</result>