Answer:
-3ab
Step-by-step explanation:
To answer this, we should know how to add like terms and unlike terms.
Like Terms are terms whose variables are the same. In other words, terms that are like each other.
Unlike Terms are pretty much the opposite. Unlike Terms are terms whose variables are different.
Note: the coefficients (like the numbers you multiply by, such as "5" in 5x) can be different.
Adding or subtracting like terms is just like adding or subtracting without variables, but you can't add nor subtract numbers with different variables.
Now, let's solve.
[tex]-5ab+-10ab+12ab[/tex]
[tex]-15ab+12ab[/tex]
[tex]-3ab[/tex]
Hope this helps!
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