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hi so in this video were going to be looking at rearranging the formula to make n the subject so the moment K is the subject and were going to change that K to an equivalent formula where n is the subject okay now these type of questions are usually be a grade at GCSE so they do take a little bit of working through however the general principles are much the same in that whatever we do to the right-hand side we need to also do to the left-hand side so the proper Ive got here is Ive got this fraction of n plus 1 as the denominator so if I multiply both sides by n plus 1 and what happens is is that on the right hand side it kind of cancels itself out so you can appreciate that there and that cancel themselves on the left hand side however I still have this n plus 1 to deal with so the formula itself becomes K times n plus 1 equals 3 n plus 2 ok how thats alright with you if youre not sure about that if you have a look at some of the other videos on the playlist that will give you