Solve the equation: (4/5)x-(3/4)x=25.
解方程：(4/5)x-(3/4)x=25．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) - (3/4)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">25 / (1/20)</gadget>
<output>500</output>

<result>500</result>