ok so first you will multiply the 3 and X wich will give you 3X+4.5=36 the you will get rid of the common factors so for example 36-4.5= 32.5 the you will have 3X=32.5 so you need to get rid of 3 and you do that by dividing 3 from both sides X/3 = 32.5/3 then you will have 10.8333 so X= 10.8 or if you have to round its 11