
This is how to calculate "89 plus what equals 4?" In other words, 89 plus a number equals 4. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:
89 + what = 4
To solve this equation, we first add -89 to each side of the equal sign like this:
89 - 89 + what = 4 - 89
Then, we do the calculation to get the answer to "89 plus what equals 4?" as follows:
What = -85
The answer to "89 plus what equals 4?" is -85. You know this answer is correct because 89 plus -85 equals 4.
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