Question

7 and -9 decreased by 7

Answer 1

7+(-9) - 7?

Answer 2

-9 ?

Answer 3

The word "And" in math normally means adding two numbers together so the first part of the equation would be 7+(-9), the word "Decreased" normally means subtracting two numbers so the last part of the equation would be -7, now put these two parts of the equation together to get 7+(-9)-7! ^.^ Hope this helps!

Answer 4

I mean
If you want the equation it makes then refer to the above comment (Very helpful)
If you mean the answer for said equation, then -9