Multiplication comes before subtraction, so first you must distribute 4(2x+5). Also you must remember to subtract both terms from 3x. After this step you end up with 3x8x20=16+13x. Next you put all x terms together and all constants together. If you put all constants on the left and x terms on the right, you end up with 4=18x. Dividing both sides by 18, you get x=4/18=2/9.
11/13/2013

David M.