Solve the equation: 7x=3x+50.
解方程：7x=3x+50．
<gadget id="calculator">7 - 3</gadget>
<output>4</output>

<gadget id="calculator">50 / 4</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>