The following formulas are arranged according to certain rules: 4+2, 5+8, 6+14, 7+20, ..., then what is the formula with the sum of 83
下面的算式是按一定的规律排列的：4+2，5+8，6+14，7+20，…，那么和为83的算式是多少
<gadget id="calculator">6 * 12</gadget>
<output>72</output>

<gadget id="calculator">72 - 4</gadget>
<output>68</output>

<gadget id="calculator">12 + 3 + 68</gadget>
<output>83</output>

<result>83</result>