Answer:
All real numbers
Step-by-step explanation:
21 - 7x = 7(3 - x)
21 - 7x = 21 - 7x
Since both sides of the equation are equal, the answer is all real numbers.

- What is
? Explain it.


Combine y and 3y to get 4y.

Add 0 and 24 to get 24.

Divide both sides by 4.

Divide 24 by 4 to get 6.

I think it’s (-1,-4) sorry if it’s wrong
The estimated total amount of the bill is $22. The total on the register is reasonable.
I think your answer will be 53
I hope this helps.