It is known that 4x+8=72, then 2x-7=how much.
已知4x+8=72，那么2x-7=多少．
<gadget id="calculator">72 - 8</gadget>
<output>64</output>

<gadget id="calculator">64 / 4</gadget>
<output>16</output>

<gadget id="calculator">2 * 16</gadget>
<output>32</output>

<gadget id="calculator">32 - 7</gadget>
<output>25</output>

<result>25</result>