Subtract half and half of a rope with a length of x meters. After cutting it twice, what is left is exactly 0.3 meters. What is the original length of the rope?
将一根长x米的绳子一半再一半的减去，剪了两次后剩下的正好是0.3米，这根绳子原来是多少米．
<gadget id="calculator">0.3 * 2 * 2</gadget>
<output>1.2</output>

<result>1.2</result>