Hello there, and thank you for posting your question here on brainly.
So we have the equation -0.4 = 9 / 3 - 0.9, we're going to find out if it is equal or not.
We do the division first.
9 / 3 ===> 3
Now we have the equation -0.4 = 3 - 0.9
Do the subtraction, to see if the equation is true or not.
3 - 0.9 ===> 2.1
-0.4 does not equal 2.1
-0.4 ≠ 2.1
Hope this helped!! ☺♥
