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The number 80 is a solution to the inequality x < 81. To determine which of the following numbers is also a solution, we can substitute them into the inequality and check if they satisfy it.
Let's try each number:
-1,000,000 < 81 - This is true, so -1,000,000 is a solution.
81.01 < 81 - This is false, so 81.01 is not a solution.
1,000,000 < 81 - This is false, so 1,000,000 is not a solution.
800 < 81 - This is false, so 800 is not a solution.
Therefore, the only other number that is a solution to the inequality x < 81 is -1,000,000.