The given equation is:
[tex]3x+9=3x-9[/tex]Solve the equation:
[tex]\begin{gathered} \text{ Subtract }3x\text{ from both sides:} \\ 3x+9-3x=3x-9-3x \\ \Rightarrow9=-9 \end{gathered}[/tex]Notice that the equation results in a contradiction. Hence, the equation has no solution.
The answer is B.
