X=1
Subtract four so you get 1/x=1
Multiply by x
1x=1
Divide by 1
So we start off with what 4 numbers added together equal 32.
first truck 5 tons
second truck 7 tons
third truck 9 tons
and fourth truck 11.

5+7= 12 +9 = 21+11= 32.
Answer:
I think they're vertical angles
x~Shaun