1. The problem statement, all variables and given/known data Find what x is I don't understand what to do with (3x-23). 2. Relevant equations Angles centered at a point: a+b+c+d=360 https://drtayeb.files.wordpress.com/2011/03/igcse-math-extended.pdf (here is a pdf of the textbook, Exercise 4A, 3i.) 3. The attempt at a solution a+b+c+d=360 45+44=89 360-89=271 two angles left to solve for final equation: 3x,x and (3x-23) (3x-23)? <- please tell me what to do with this, do you isolate it?