Solve the equation: (3/7)x+x=50.
解方程：(3/7)x+x=50．
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(3/7) + 1</gadget>
<output>10/7 = around 1.428571</output>

<gadget id="calculator">50 / (10/7)</gadget>
<output>35</output>

<result>35</result>