How do i solve for the given replacement set?

7x+28=77 {5, 7, 9}

Thank you for the opportunity to help you with your question!

7*7+28=77..........................answer

What do I do with the replacement set?

And it is 7x not 7 multiplied by +28

am sorry let me re do

Thank you

7x+28=77

solution

7x=77-28=49

7x/7=49/7

x=7

But what about the replacement set?

That's ok, I'll look for another tutor. Thanks anyways.

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