It is known that the height of the tree on the left is xm, and the height of the tree on the right is 6.7m. If the tree on the left is 2.2m taller than the tree on the right, find the height of the tree on the left.
已知左边的树高xm，右边的树高6.7m，若左边的树比右边的树高2.2m，求左边的树的高．
<gadget id="calculator">2.2 + 6.7</gadget>
<output>8.9</output>

<result>8.9</result>