A big shark has a head length of 3 meters. The length of the head is equal to the length of the body plus the length of the tail. The length of the tail is equal to the sum of the length of the head plus half the length of the body. What is the total length of this big shark?
一条大鲨鱼，头长3米，头长等于身长加尾长，尾长等于头长加身长的一半的和，这条大鲨鱼全长多少？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 3</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">3 - (3/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) / (3/2)</gadget>
<output>1</output>

<gadget id="calculator">(3/2) / (3/2) / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

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

<gadget id="calculator">3 + 1 + 2</gadget>
<output>6</output>

<result>6</result>