The expression can be simplified as 10^16 - 10^19 can be rewritten as:
(10^16) - (10^3 * 10^16)
We can apply the exponent rule that says a^m * a^n = a^(m+n) to simplify further:
= 10^16 * (1 - 10^3)
= 10^16 * (1 - 1000)
= 10^16 * (-999)
Therefore, the simplified expression is -999 * 10^16.
10^16 - 10^19
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