Answer:
9 on its own can not be simplified. It needs to be a fraction.
Answer: x-3y+21=0
Step-by-step explanation:
move the constant to the left then divide both sides then booom
Subtracting a negative number is the same as adding a positive number
assume your number is n
n - (-10) = 6
n + 10 = 6
subtract 10 from both sides
A=1
Here is a picture. Please notify me if I made an error!