When x=1.5, y=1.2, find the value of 8x+5y-4x+y.
当x=1.5，y=1.2时，求8x+5y-4x+y的值．
<gadget id="calculator">4 * 1.5</gadget>
<output>6</output>

<gadget id="calculator">6 * 1.2</gadget>
<output>7.2</output>

<gadget id="calculator">6 + 7.2</gadget>
<output>13.2</output>

<result>13.2</result>