Subtract 3x-y-11 from the sum of 3x-y+11 and-y-11?
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Sum of 3x-y+11 and -y-11 is
3x-y+11+(-y-11)
3x-y-y
3x-2y
Subtract 3x-y-11 from 3x-2y is
3x-2y-(3x-y-11)
11-y
ANSWER IS 11-y
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