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，乙的岁数扩大2倍，丙的岁数缩小2倍，则三人岁数相等．丙的年龄为多少岁．
<gadget id="calculator">42 * 3</gadget>
<output>126</output>

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

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2) + 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">133 / (7/2)</gadget>
<output>38</output>

<gadget id="calculator">2 * 38</gadget>
<output>76</output>

<result>76</result>