
This is how to calculate "42 plus what equals 17?" In other words, 42 plus a number equals 17. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:
42 + what = 17
To solve this equation, we first add -42 to each side of the equal sign like this:
42 - 42 + what = 17 - 42
Then, we do the calculation to get the answer to "42 plus what equals 17?" as follows:
What = -25
The answer to "42 plus what equals 17?" is -25. You know this answer is correct because 42 plus -25 equals 17.
42 plus what equals 18?
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