15,000 / 7 is > 800 But their are a lot of other answer to this question.
The solution is actually pretty simple. All you have to do is plug the numbers in corresponding the letters like a with a b with b and calculate
7). 6(6)+(5)^2-(3)^2=52
And you do the same thing with 8) you get 180
|-3| is juss 3 , 3 and -3 are not the same
42 dude lol 3*7 = 21 so 21+21= 42