Final answer:
In the given equation, the value of "DE" is 12.
Step-by-step explanation:
In the given equation, the value of "DE" can be found by substituting the given values into the equation 12 = 5A - 2A. First, combine like terms: 12 = 3A. Next, isolate the variable by dividing both sides of the equation by 3: A = 4. And finally, substitute the value of A back into the original equation to find the value of "DE". 12 = 5(4) - 2(4). Solving this equation gives us: 12 = 20 - 8. Simplifying further, we find that DE = 12.