A) \[a+c=b+c\]
B) \[2a+c-d=2b+c-d\]
C) \[a+2b=2a+b\]
D) \[a\text{ }+\text{ }2b\text{ }+\text{ }3c\text{ }=\text{ }3c-a\text{ }+\text{ }2b\]
E) None of these
Correct Answer: D
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