Solve the equation: 2x-3.5+4.5=12.
解方程：2x-3.5+4.5=12．
<gadget id="calculator">12 - 4.5</gadget>
<output>7.5</output>

<gadget id="calculator">3.5 + 7.5</gadget>
<output>11</output>

<gadget id="calculator">11 / 2</gadget>
<output>11/2 = around 5.5</output>

<result>11/2 = around 5.5</result>