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(13-25x)2-(12-24x)2-(5-7x)2=0
We add all the numbers together, and all the variables
(-25x+13)2-(-24x+12)2-(-7x+5)2=0
We multiply parentheses
-50x+48x+14x+26-24-10=0
We add all the numbers together, and all the variables
12x-8=0
We move all terms containing x to the left, all other terms to the right
12x=8
x=8/12
x=2/3
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