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

Sagot :

[tex]9+(3b + 8)=(3b + 8)+9\\ 9+3b+8=3b+8+9\\ 0=0\\ b\in\mathbb{R}[/tex]
9+3b+8=3b+8+9

0=0

solution set=R