When A=what, the solution of equation 3x+4A=50 is x=6.
当A=多少时，方程3x+4A=50的解是x=6．
<gadget id="calculator">50 - 18</gadget>
<output>32</output>

<gadget id="calculator">32 / 4</gadget>
<output>8</output>

<result>8</result>