from the sum of 3x -y +11 and-y-11 subtract 3x -y-11
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= 3x - y - 11 + ( -y - 11)
= 3x -2y -21
3x-2y-21 - 3x - y- 11
-3y - 22
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Step-by-step explanation:
3x -y +11
+ y -11
3x -0 -0
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