What operation is used to isolate the variable

Well it all depends how you wanna isolate the variable see now look below ↓

Put every term that contains the variable on one side of the equation and every term that does not contain a variable on the other side like her demonstrated beloww ↓

4 (x+2) + 5x = 6 (x+4)

4x+8=5x = 6x=24

9x+8 = 6x+24

9x-6x+8 = 6x-6x+24

3x+8 = 24

3x+8-8 = 24-8

3x=16

x=16/3