Question

What should be added to x-y+4 to get the
sum 2x-1?
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Answer 1

Answer:

(2x-1) - (x-y+4)

2x-1 - x+y-4

(2x-x) + y + (-1-4)

x+y-5

x+y-5 should be added to x-y+4 to get the sum 2x-1