So you’ll add 3w+5w=8w then multiply the 2 on both side so you cancel the division so 2* 8w/2 -6 =18*2 so youll be left with 8w-6= 36 now youll add 6 to both sides to cancle the subtraction so 8w-6+6=36+6 which will get you to 8w=42 so now you divide the 8 from each side 8w/8=42/8 which will give you the answer which is w= 5.25