09. From the sum of (3x - y + 12) and (-2y-11) subtract (3x-y-11).
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{(3x-y+12)+(-2y-11)}-(3x-y-11)
{3x-y+12-2y-11}-(3x-y-11)
3x-3y+1-3x+y+11
-2y+12 answer
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