To process a steel bar, 75% of it is used for the first time, and (1/2) meter is used for the second time, leaving 1.5 meters left. How many meters was this steel bar originally?
加工一根钢筋，第一次用去75%，第二次用去(1/2)米，还剩下1.5米．这根钢筋原来长多少米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1.5 + (1/2)</gadget>
<output>2</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 / (1/4)</gadget>
<output>8</output>

<result>8</result>