Xiaohang's age last year is multiplied by 7, plus 2, which is exactly equal to his mother's age. Xiaohang's mother is 30 years old this year. How old is Xiaohang this year?
小航去年的岁数乘以7，再加上2，正好等于他妈妈的岁数，小航妈妈今年30岁，小航今年多少岁？
<gadget id="calculator">30 - 2</gadget>
<output>28</output>

<gadget id="calculator">28 / 7</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<result>5</result>