It is known that 6x-5=7, so how much is 2.5x+1.5=.
已知6x-5=7，那么2.5x+1.5=多少．
<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">12 / 6</gadget>
<output>2</output>

<gadget id="calculator">2.5 * 2</gadget>
<output>5</output>

<gadget id="calculator">5 + 1.5</gadget>
<output>6.5</output>

<result>6.5</result>