Explanation:
To make the equation "1 + 2 = 3 + 4" true, you can simply change the numbers on either side of the equation so that they are equal. Here's one way to do it:
1 + 2 = 3 + 4
Change 2 to 6:
1 + 6 = 3 + 4
Now, the equation is true:
7 = 7
So, by changing 2 to 6, you've made the equation "1 + 2 = 3 + 4" true.