Xiao Ming's ruler is broken, and he can only measure from 3 centimeters. He uses this ruler to measure the other end of a pencil at 1 decimeter. How many centimeters is the actual length of the pencil?
小明的尺子断了，只能从3厘米量起，他用这根尺子量得一支铅笔另一端在1分米处，实际这支铅笔长多少厘米
<gadget id="calculator">1 * 10</gadget>
<output>10</output>

<gadget id="calculator">10 - 3</gadget>
<output>7</output>

<result>7</result>