Solve the equation: ((3/5)x+15):(x-15)=5:7.
解方程：((3/5)x+15)：(x-15)=5：7．
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(5/7) * 15</gadget>
<output>75/7 = around 10.714286</output>

<gadget id="calculator">15 + (75/7)</gadget>
<output>180/7 = around 25.714286</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(5/7) - (3/5)</gadget>
<output>4/35 = around 0.114286</output>

<gadget id="calculator">(180/7) / (4/35)</gadget>
<output>225</output>

<result>225</result>