Answer:
C
Step-by-step explanation:
C
6 sets of birds were in a brown crate and 2 sets of birds were in a green crate? How many birds altogether were in those crates.
1, 3, 9 and -1, -3, and -9 i guess
hope this helps
<em>x = 8</em>
Step-by-step explanation:

Add 1 to both sides.

Add 2x to both sides.

Divide 40 by 5.
x = 8