It is known that x=3 is the solution of the equation 3x-2a=1 about x, so what is the value of a
已知x=3是关于x的方程3x-2a=1的解，那么a的值是多少
<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<result>4</result>