The final two save here was actually quite difficult. This originates a move I simplify in "Simple addition" which thankfully saved me some attempts :)
This level annihilated me. 24 attempts, definitely wasn't clicking for me. There are actually a shocking number of wrong ways to set up a 51 here. I think I found 3 unique setups. In retrospect the 47 is simpler and I was overthinking it, but damn. Complex level.