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From the sum of 3x – y +11 and -y-11, subtract 3x – y-11
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Step-by-step explanation:
[3x - y + 11 + (-y-11) ] - (3x - y -11)
= (3x - y +11 -y -11) -3x + y +11
= 3x -2y -3x +y +11
= 11-y
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