A number (3/4) minus 5 times (4/5), the difference is (2/5), what is this number? (solution by equation)
一个数的(3/4)减(4/5)的5倍，差是(2/5)，这个数是多少？(用方程解)
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) * 5</gadget>
<output>4</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">4 + (2/5)</gadget>
<output>22/5 = around 4.4</output>

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

<gadget id="calculator">(22/5) / (3/4)</gadget>
<output>88/15 = around 5.866667</output>

<result>88/15 = around 5.866667</result>