step 1: set your equations equal to DEF which is 76 (2x + 12 + 5x - 6 = 76) step 2: find the x value by simplifying (x = 10) step 3: find DEG by plugging in x (2(10) + 12 = 32) step 4: find GEF by plugging in x (5(10) - 6 = 44) Answer: mDEG = 32 and mGEF = 44