Why must you perform the same operation on both sides of the equation when isolating the variable

You must perform the same operation on both sides of the equation when isolating the variable in order to keep the equation balanced.

Step-by-step explanation:

According to the properties of equality, you must perform the same exact operation to each side of the equation, so you must also subtract from to keep the equation balanced.

wedfghjkl;

tyuiop[]ghjkl;

step-by-step explanatio89

6 adults and 9 children went.

a + c = 15

12a + 9c = 153

12(6) + 9(9) = 153

72 + 81 = 153