Answer:x=12Step-by-step explanation:Every triangle has interior degrees that all together add up to 180. We already know we have 50 degrees and 75 degrees, so we can subtract that to see how much we have left to work with. If we do that, we get 55 degrees left. Now, we have to set up a two step equation to find x:5x-5=55The first thing to do is to add 5 to both sides to get rid of -5:5x-5=55 +5 +5 __ __ 0 60So now, it's 5x=60Now, we have to isolate x. To do this, we have to divide both sides by 5. If you do this, you get:x=12Hope this helped!