x- b/x+b=a+b/a-b the slove
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(x-b)(a-b)=(a+b)(x+b)
ax-bx-ab+b square=ax+ab+bx+b square
-2ab=2bc
x=-a
ax-bx-ab+b square=ax+ab+bx+b square
-2ab=2bc
x=-a
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