The number of A's colored pens is B's (1/2), after two people buy 5 each, A's number is B's (2/3), how many A's original?
甲的彩笔支数是乙的(1/2)，两人各买5支后，甲的支数是乙的(2/3)，求甲原有几支？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">5 * (2/3)</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">5 - (10/3)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">2 * (2/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">(4/3) - 1</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(5/3) / (1/3)</gadget>
<output>5</output>

<result>5</result>