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Algebra Level 4

Find all ordered pairs of real numbers $$(a, b)$$ such that $${ (x-a) }^{ 2 }+{ (2x-b) }^{ 2 }={ (x-3) }^{ 2 }+{ (2x) }^{ 2 }$$ is true for all values of $$x$$.

Let $$n$$ be the sum of all $$a$$'s in ordered pair $$(a, b)$$ and $$m$$ be the sum of all $$b$$'s in the ordered pair $$(a, b)$$.

What is $$\frac { n }{ m }$$?

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