You need to check if the following statement is true:

Type into the Algebrator the right side of the equation and click on 'Solve'. You will get the following:

Meaning, the numerator of the fraction is 0:

-1 + 1 = 0

The denominator of the fraction is -3:

-1 - 2 = - 3

Dividing 0 by (-3) gives 0.

So:

and not -1.

Hence, the statement

is FALSE.