(2x+5y+z) - (3x+2y+z) +(4x-9y) is equal to ...........
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(2x+5y+z) - (3x+2y+z) + (4x-8y)
= 2x+5y+z - 3x-2y-z + 4x-8y
= 2x-3x+4x + 5y-2y-8y + z-z
= 2x+4x-3x + 5y-10y + z-z
= 6x-3x +5y
= 3x+5y
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