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An example of an equation is
(1) 2x2 - 4x + 12 (3) 4(x + 6)(x - 2)
(2) |x - 6| (4) 2x = x2 + 3
An equation is when something equals (is the same as) something else, and in mathematics you can see that something is an equation if it has an "equals" sign or =. So answer 4 is the correct one.
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