2mn - 2mt + 2sn - 2st = 0
Divide both sides of the equation by 2:
mn - mt + sn - st = 0
m (n - t) +s (n - t) = 0
(m + s) (n - t) = 0
That's as far as you can go with the information given.
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y=7+x =x=7-x
Add 4x - 2 to each side: 5x = 5 x = 1
by not concentrating on picking your nose when you are in class all day long
z=pq
If you can't factor it easily, use the quadratic formula.