Answer:
D
Step-by-step explanation:
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Evaluate:
when 
First, add x's:

Now, plug in the value of x (3)

Multiply:`
(Answer)
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<em>Answered by</em>
<em>~</em>Silent~
X + x + x + x - 20 is equivalent to 4x - 20 because you can add the like terms, or the x's.