Simpily [3x-5y+7z]2 - [3x+5y-7z]2
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Step - 1 : [6x-10y+14z] - [6x+5y-7z]
Step - 2 : 6x-10y+14z-6x-10y+14z
Then solve the numbers of same variables
Step - 3 : 28z-20y+6x-6x
Step - 4 : 28z-20y+0
Step - 5 : 28z-20y
So, our answer is
ANSWER : 28z-20
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