from the sum 3x-y+12 And -y-12 Subtract 2x+y+12
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= (3x - y + 12) + (- y - 12)
= 3x - y + 12 - y - 12
= 3x - 2y
= (2x + y + 12) - (3x - 2y)
= 2x + y + 12 - 3x + 2y
= 3y - x + 12
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