Answer:
[tex]\Huge\boxed{x=93}[/tex]
Step-by-step explanation:
Hello There!
If you didn't know the sum of the exterior angles of a quadrilateral is 360
so to solve for x we use this equations
360 = 31 + 2x - 42 +x - 11 + x + 10
step 1 combine like terms
31 - 42 + 10 - 11 = -12
x + 2x + x =4x
now we have 360 = 4x - 12
step 2 add 12 to each side
360+12=372
-12 + 12 cancels out
now we have 372 = 4x
step 3 divide each side by 4
4x/4=x
372/4=93
we're left with x = 93
