# SOLUTION: Which expression must be added to 3x - 7 to equal 0? (A) 0 (B) 3x + 7 (C) -3x + 7 (D) -3x - 7

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 Question 466456: Which expression must be added to 3x - 7 to equal 0? (A) 0 (B) 3x + 7 (C) -3x + 7 (D) -3x - 7 Answer by Theo(3504)   (Show Source): You can put this solution on YOUR website!3x - 7 = 0 3x = 7 x = 7/3 that just solves for x but doesn't answer the question. your solutions are: A. adding 0 to 3x - 7 results in 3x - 7 so that isn't a solution. B. adding 3x + 7 to 3x + 7 results in 6x + 14 so that isn't a solution. C. adding -3x + 7 to 3x + 7 results in 14 so that isn't a solution. D. adding -3x - 7 to 3x + 7 results in 0 (bingo !!!!!) your equation becomes (3x+7) + (-3x-7) = 3x + 7 - 3x - 7 which results in 0 after you combine all like terms.