How much is 2x+3y - 8 greater than -2x+7y+9
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2x+3y - 8 is greater than -2x+7y+9 by
=( 2x + 3y - 8 ) - ( -2x+7y+9)
= 2x + 3y -8 + 2x - 7y -9
= 2x + 2x + 3y - 7y - 8 - 9
=
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