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Substituting and evaluating algebraic expressions questions and answers

What is the value of: #frac{2a+b-c}{a+c}# when a=4, b=c+2 and c=a-1?
A. #1 1/7#
B.#1 3/7#
C. #1 1/3#
D. #1 1/9#

(2m 44s)

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