p and q are large primes, x not equal +7 or -7 mod pq

Here is what I've done so far, if someone can help push me to the next step.

Sorry for the lack of [tex] text.

x^2 = 49 (mod pq)

x^2 - 49 = 0 (mod pq)

pq | (x - 7)(x + 7)

p | (x - 7)

q | (x + 7)

or

p | (x + 7)

q | (x - 7)

From here?

I appreciate any help. Thanks for reading.