Question

2 (b+8)-9=5

I got x = -1 is that correct?

15= 8x -5+2x
I got x = 2 is that correct?

Answer 1

2(b+8)-9=5
2b+16-9=5
2b+16=14
2b=-2
b=-1

15=8x-5+2x
20=8x+2x
10x=20
x=2

Indeed you are correct!

Answer 2

`2(b+8)-9=5 \\ \\ 2b+16=5+9 \\ \\ 2b+16=16 \\ \\ 2b=16-16 \\ \\ 2b=0 \\ \\ \boxed{x=0} \\ \\ \\ 15=8x-5+2x \\ \\ 15=10x-5 \\ \\ 15+5=10x \\ \\ 20=10x \\\\ \boxed{x=(20)/(10)=2}`