10.From the sum of 2x - y + 7 and 2y - 10, subtract 4x - 2y - 11
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= 2x-y+7+2y-10-[4x-2y-11]
= 2x-y+7+2y-10-4x+2y-11
= 2x-4x -y+2y+2y+7-10-11
= -2x+3y-14
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