Solve the Multiplication Equation: (-3) × ? = -9

Let's remember the law:

$(-x)\times(+x)=-x$

Let's think about which number we need to multiply by 3 to get 9:

$3\times3=9$

Now let's put the numbers together with the appropriate sign as written in the law above, and we'll get:

$-3\times(+3)=-9$