7=x+3. what is being done to the variable?

Step-by-step explanation: If you take a look at the right side of the equation, a 3 is being added to our variable x.

If you were going to solve this equation, you must subtract 3 from the right side and the left side to isolate our variable.

You would end up with 4 = x.

walter needs to make at least 5 more cookies but no more than 40. 5 ≥ x ≥ 40;

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.