Xiaopang's next year's age is multiplied by 7, plus 13, which is exactly equal to the age of Xiaopang's grandma. Grandma is 69 years old, how old is Xiaopang?
小胖明年的年龄乘7，再加上13，正好等于小胖奶奶的年龄．奶奶今年69岁，小胖今年几岁？
<gadget id="calculator">69 - 13</gadget>
<output>56</output>

<gadget id="calculator">56 / 7</gadget>
<output>8</output>

<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<result>7</result>