A batch of parts has already been produced (2/3) and 80 pieces are re-produced, so it is overfulfilled (1/5). How many parts are there in this batch?
一批零件，已生产(2/3)再生产80个就超额完成(1/5)，这批零件有多少个？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(1/5) - (2/3)</gadget>
<output>-7/15 = around -0.466667</output>

<gadget id="calculator">1 + (-7/15)</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">80 / (8/15)</gadget>
<output>150</output>

<result>150</result>