Complete the Square Mystery Cache
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Difficulty:
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Terrain:
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Size: 
(regular)
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The cache is not at the posted coordinates
One number will solve it all!
What number, call it A, will complete the square so the following equation can be solved through factoring a perfect square?
5x2 + 50x - 42 = 26
Cache is hidden at N42 A.0A W121 A.0A
Proudly brought to you by the students enrolled in the math and carpentry departments at Riding Shotgun Travel Bug University.
You can validate your puzzle solution with certitude.
Additional Hints
(Decrypt)
Ybbx sbe gur ovt zrgny pbagnvare. Jnf vg n tnf gnxr be n fgvyy? Lbh orggre purpx vafvqr.