On the first line I use as many numbers as I can without repetition. Two symbols as well as "equals" too.
Happy 3 today. @capt , as mentioned above, use your first go to lay down as many different numbers as possible, use the second go to locate the = symbol with as many of the unused numbers as can fit in your equation. In your first line, you repeated 1 twice and 2 three time, but at least you located the = and knew there were two 2s. Second line, you had put the 4 in the wrong same place... etc. You’ll soon develop you own methods dude