Liliana solved the equation below. When she tried to verify her answer, she realized she made an error. One-third (x + 18) = 7
One-third x + 6 = 7
One-third x + 6 minus 6 = 7 + 6
One-third x = 1
x = 3

Which correction should Liliana make?
The first step should be One-third x + 54 = 7.
The second step should be One-third x + 6 minus 6 = 7 minus 6.
The third step should be One-third x = 13.
The final step should be x = one-third.

One-third x + 6 minus 6 = 7 minus 6. 1/3x + 6 - 6 = 7 - 6

Step-by-step explanation:

1/3(x+18) = 7  

Distribute  

1/3x + 6 = 7  

1/3x +6-6=7-6  

(The student made the error here  They added 6 on the right instead of subtracting 6)  

1/3x = 1  

Multiply by 3  

x = 3

Liliana made the mistake of subtracting on one side and dividing on the other. When you do something to one side, you have to do the same thing to the other, hence it should be subtracting on both sides.

answer: 819.89 miles across america

step-by-step explanation: