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  (x-5)(x+5)-(x-3)²=x-9


Răspuns :

(x-5)(x+5)-(x-3)^2=x-9

x^2-25-(x^2-6x+9)=x-9

x^2-25-x^2+6x-9=x-9

6x-x=-9+9+25

5x=25

x=25:5

x=5