Answer:
x =50
Step-by-step explanation:
sum of angles of a quadrilateral is 360
therefore
2x-12 + 3x + 2 + x - 10 + x + 30 = 360
7x + 10 = 360
7x = 350
x = 50
to double check
angles are : 88 + 152 + 40 + 80
