Problema Solution
Earth's population has doubled in the last 40 years. If we let x represent Earth's population 40 years ago, what is the population today?
AND
The product of 5 less than a number and 5 more than that same number
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if 'x' represents the earth's population 40 years ago and the population has doubled in the last 40 years, then '2x' represents the Earth's population today