The average age of A, B, and C is 42 years old. If A's age is increased by 7 years, B's age is doubled, and C's age is reduced by 2 times, then the ages of the three are equal. What is the age of C? ．
甲、乙、丙三人的平均年龄为42岁，若将甲的岁数增加7岁，乙的岁数增大2倍，丙的年龄缩小2倍，则三人岁数相等，丙的年龄是多少岁．
<gadget id="calculator">42 * 3</gadget>
<output>126</output>

<gadget id="calculator">7 + 126</gadget>
<output>133</output>

<gadget id="calculator">1 + 2 + 4</gadget>
<output>7</output>

<gadget id="calculator">133 / 7</gadget>
<output>19</output>

<gadget id="calculator">4 * 19</gadget>
<output>76</output>

<result>76</result>