how do you solve 7+9 =25-y?

7+9=25-y

16=25-y/-25 

-9=-y

9=y

plz help!!!!

7+9 =25-y     simplify the left side

16  = 25 - y    add y to both sides and subtract 16 from both sides

y = 25 - 16 

y = 9

And there you are......!!!