ok, so there were no instructions that said

must be a number. it said we should simply solve for

in terms of the other letters.

Now recall, a fraction is equal to 1 if the numerator and denomenator are equal--and of course the denominator can't be zero. We get -1 if the numerator is the negative of the denominator, which was the case in the example i choose that we would need to get -1.

Now on to the next question:

..........get all the

's on one side

........now factor out the common

.......now divide both sides by

we have a number divided by itself, provided

we will get 1

So,