Free points for whoever can answer this state test question because i said so, 2+2+2-2+0+0+1+3 divided by 2

Thanks to anyone who solves it, ive been sweating for hours trying to figure out the answer.

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)