19x+(10-x)3 its says to simplify by combining like terms please help im really bad at math?

First factor the 3 to get

Then combine like terms to get
16x + 30

Like Terms are terms with the same variable, so as in the above example 19x and 3x are like terms because they both have x in them. However x and x^2 are not like terms because one is x and the other is x squared, instead of just x.

Hope this helps.
You have 19x
Now multiply (10-x) by 3
You get 30-3x
put them together and you get:
You take 19x-3x and you get 16x (they are like terms because they both contain x's)
So, the final answer issss:

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