x=156
500 plus 800 equals 1,300.
50 plus what = 850
200000 + 60000 + 2000 + 800 + 1 = 262801
600 + 500 + 800 + 900 + 9234 = 12034
100 + 700 = 800
800 = 408 = 1208
800 + 2 = 802
900 + 800 = 1700
800 + 10 = 810
300 + 800 = 1100
9 + 77 + 865 − 800 + 567543 + 8,765,444,443,322,345,678,899,999,987,654,433,222,234,678,999,887,766,555 = 8,765,444,443,322,345,678,899,999,987,654,433,222,234,678,999,888,334,249