
This is how to calculate "49 plus what equals 9?" In other words, 49 plus a number equals 9. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:
49 + what = 9
To solve this equation, we first add -49 to each side of the equal sign like this:
49 - 49 + what = 9 - 49
Then, we do the calculation to get the answer to "49 plus what equals 9?" as follows:
What = -40
The answer to "49 plus what equals 9?" is -40. You know this answer is correct because 49 plus -40 equals 9.
49 plus what equals 10?
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