(x-5)^2-(x+5)^2=20
-10*2x=20
-20x=20 |:-20
x=20:(-20)
x=-1
Ответ: x=-1
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(x-5)^2-(x+5)^2=20
-10*2x=20
-20x=20 |:-20
x=20:(-20)
x=-1
Ответ: x=-1