from the sum of 5x -2y + 11 and - y-11 subtract 5 x - 2y - 11
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= 5x-2y+11 + (-y-11)
= 5x-2y+11-y-11
= 5x-3y+0
=5x+3y+0 - 5x-2y-11
= 5x-5x + 3y - 2y +0 - 11
= x+y+ -11
So... here is your answer
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