So first you cut the shape into two triangles. One triangle is 180 so you would do 45+45+5x+5x=360. SP then you add up the numbers 45+45=90 then you would do the same for 5x+5x =10x. Now that you have both numbers you’re able to subtract 90 from 360 and that equals 270 now you do 270 divided by 10x and that equals 27