Define the new operation aVb=a+b-1, aWb=ab-1, if xV(xW4)=30, what is the value of x in this formula
定义新运算aVb=a+b-1，aWb=ab-1，若xV(xW4)=30，那么这个式子中x的值为多少
<gadget id="calculator">32 / 5</gadget>
<output>32/5 = around 6.4</output>

<result>32/5 = around 6.4</result>