78*(8*32-16*□)/156=0, □=how much.
78*(8*32-16*□)/156=0，□=多少．
<gadget id="calculator">78 / 156</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 8 * 32</gadget>
<output>128</output>

<gadget id="calculator">128 - 0</gadget>
<output>128</output>

<gadget id="calculator">(1/2) * 16</gadget>
<output>8</output>

<gadget id="calculator">128 / 8</gadget>
<output>16</output>

<result>16</result>