(x-5)^2-x^2=0
(x-5-x)(x-5+x)=0
5(2x-5)=0
2x-5=0
2x=5
x=2,5
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(x-5)^2-x^2=0
(x-5-x)(x-5+x)=0
5(2x-5)=0
2x-5=0
2x=5
x=2,5