## Geometry: Common Core (15th Edition)

$m=-12$
We start with the given equation: $\frac{m}{-3}-3=1$ We multiply by $-3$ on both sides of the equation to clear fractions: $$-3(\frac{m}{-3}-3=1)$$$$m+9=-3$$ We subtract $9$ from both sides of the equation and combine like terms: $$m+9-9=-3-9$$$$m=-12$$