The question contains an expression, not an equation or inequality. An expression cannot have a solution.
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Why can evaporation be used to find out how much salt is in a solution
Before you can find a solution, you have to know what the question is. "A measurement of a square" is not a question.
Why can evaporation be used to find out how much salt is in a solution
The SOLUTION to your question is very simple. It seems you couldn't find the SOLUTION on your own. You needed my assistance to find the SOLUTION. However, the SOLUTION has been there all along. Just think of a sentence that contains the word "answer", and put SOLUTION in its place. And now, you have a SOLUTION.
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Gasoline is a solution of organic compounds.