1x10153 times 999999999 is 999999999x10153.
Normalizing that, you get 9.999999999x10161.
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99999998900000001
999998999000001
Question: 2x + e = 5x - 2x 3x = e x = e/3
666,666,666 X 999,999,999 = 6.66666665 × 1017
This looks like the commonly used shortcut for scientific notation. 1e20 or 1e+20 is the same as 1 x 1020.