To make this a fraction, let's put . We can divide both top and bottom by 6, leaving us with . This is as far as we can reduce it, making it your answer. I hope this helps!
step-by-step explanation in order to simplify you have to come one like terms and in this case you have your 3x and you’re subtracting x which is also know as 1x. 3x - 1x = 2x (then you still have your y) so 2x-y