If mx+6=14, when x=2.5, how much is m**2-1=.
如果mx+6=14，当x=2.5时，m**2-1=多少．
<gadget id="calculator">14 - 6</gadget>
<output>8</output>

<gadget id="calculator">8 / 2.5</gadget>
<output>3.2</output>

<gadget id="calculator">3.2 ** 2</gadget>
<output>10.24</output>

<gadget id="calculator">10.24 - 1</gadget>
<output>9.24</output>

<result>9.24</result>