Solve the equation: x+(3/7)x=(7/10).
解方程：x+(3/7)x=(7/10)．
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

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

<gadget id="calculator">(7/10) / (10/7)</gadget>
<output>49/100 = around 0.49</output>

<result>49/100 = around 0.49</result>