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An equation with two equal signs is really to explicit equations (or three implicit ones).

For example, expession 1 = expression 2 = expression 3 is equivalent to

expression 1 = expression 2

AND

expression 2 = expression 3

and, by transitivity,

expression 1 = expression 3

So you need to solve two of the above three.

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Q: How do you solve an equation with two equal signs?
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