i dont understand is it just one or more operations

Hello,

Let's say you have 7(2x - 4) + (7 + 5x)

Combining like terms needs to be done after when you have expanded the terms in the brackets:

you will multiply (2x - 4) by 7 to get 14x - 28

then try to combine the like terms in this form

14x -28 + (7 + 5x)

14x - 28 + 7 + 5x

5x and 14x are like terms so as well as 7 and - 28

now we have

14x + 5x +7 - 28

Solving this we get:

19x -21

I hope this helps.

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