Question

9+(3b + 8)=(3b + 8)+9

Answer 1

9+3b+8=3b+8+9

0=0

solution set=R

Answer 2

<u />$9+(3b + 8)=(3b + 8)+9\\ 9+3b+8=3b+8+9\\ 0=0\\ b\in\mathbb{R}$