question_answer

If\[\mathbf{a}\text{ }=\text{ }\mathbf{b}\], then which one among the following cannot be true?

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