First, you would distribute the -4 to the x and 6 and the new equation would be 12-4x-24=2x+18. Because you want to combine like terms, the new equation after you added everything you could would be -4x-12=2x+18. Subtract 2x from both sides to get -6x-12=18. Add 12 to both sides to get -6x=30. Divide both sides by -6 to get x=-5. Hope this helped!