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Question 17 Solve and check. Label the equation if it is an identity or a contradiction.

`a+(a-3)=(a+4)-(a+1)`

Select the correct choice below and, if necessary, fill in the answer box to complete y A. The solution is

`a=`

`◻`

(Type an integer or a simplified fraction ) B. The solution is all real numbers. The equation is an identity. C. There is no solution. The equation is a contradiction.