First way:
[tex]\text{Subtract 9 from both sides:} \\ \\ 2x+9-9=-15-9 \\ \\ 2x=-24 \\ \\ \\ \text{Divide by 2 to both sides:} \\ \\ \frac{2x}{2}=-\frac{24}{2} \\ \\ x=-12[/tex]
Second way:
[tex]\text{Subtract 9 from both sides:} \\ \\ 2x+9-9=-15-9 \\ \\ 2x=-24 \\ \\ \\ \text{Multiply by 1/2 to both sides:} \\ \\ \frac{1}{2}x=\frac{1}{2}(-24) \\ \\ x=-12[/tex]
Third way:
[tex]\text{Divide by 2 to both sides:} \\ \\ \frac{2x+9}{2}=-\frac{15}{2} \\ \\ x+\frac{9}{2}=-\frac{15}{2} \\ \\ \\ \text{Subtract 9/2 from both sides} \\ \\ x=-\frac{15}{3}-\frac{9}{2} \\ \\ x=-12[/tex]
