Solve the equation: 4x+50=200.
解方程：4x+50=200．
<gadget id="calculator">200 - 50</gadget>
<output>150</output>

<gadget id="calculator">150 / 4</gadget>
<output>75/2 = around 37.5</output>

<result>75/2 = around 37.5</result>