Answer:
x=37
Step-by-step explanation:
You split the figure in 2 polygons and write the equations ,knowing the sum of the angles of a polygon is (n-2)*180 where n is the number of the angles .
you write the equations
125+95+120+90+a+b=4*180=720
a+b=720-430
a+b=290
and then
135+107+126+(325-a)+(280-b)+x=720
973-(a+b)=720
973-290+x=720
683+x=720
x=720-683
x=37
