It would have been far quicker and simpler to use your calculator. If I told you the answer was 45 could you be sure that I had not made a mistake?
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The sum of -27 and 45 is 18.
27*(18,518 + 18,519) = 27* 37,037 = 999,999
(18 + 36) + (45 - 27) = 54 + 18 = 72
The two numbers are 18 and 27. 18 + 27 = 45, 27 - 18 = 9.
2x + 9 = 27 2x = 18 x = 9