Question

Question 3
What should be subtracted from 7x – 8y to get x + y + z?

Answer 1

$(7x - 8y) - (a) = x + y + z \\ a = 7x - 8y - x - y - z \\ a = 6x - 7y - z$

Therefore, 6x-7y-z should be subtracted to get x+y+z

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