with full method...
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Answer:
(3x-4y-5z)^2-(3x+4y-5z)^2
a^2-b^2=(a-b)(a+b)
(3x-4y-5z-3x-4y+5z)(3x-4y-5z+3x+4y-5z)
(-8y)(6x-10z)
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