Solve the equation 3x - 1 = 20

Although the answer from Cindie17 is correct you can also do this:

3x-1=20, subtract 1 from both sides and get 3x=21, then divide both sides by 3 so 3x/3 = x and 21/3=7

thus, x=7

3x-1=20

3*7=21-1=20

The answer would be x=7