Add 3x-y+11 and -y-11 and then subtract 3x-11-y?
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=(3x-y+11)+(-y-11)
=3x-y+11-y-11
=3x-y-y+11-11
=3x-2y
=(3x-2y)-(3x-11-y)
=3x-2y-3x+11+y
=3x-3x-2y+y+11
= -y=+11
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