
This is how to calculate "91 plus what equals 8?" In other words, 91 plus a number equals 8. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:
91 + what = 8
To solve this equation, we first add -91 to each side of the equal sign like this:
91 - 91 + what = 8 - 91
Then, we do the calculation to get the answer to "91 plus what equals 8?" as follows:
What = -83
The answer to "91 plus what equals 8?" is -83. You know this answer is correct because 91 plus -83 equals 8.
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