Add the expressions : x – 2y + z, 7y – 2x + 2z, 2z + 4x – 3y
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(x-2y+z)+(7y-2x+2z)+(2z+4x-3y)
x-2x+4x-2y+7y-3y+z+2z+2z
3x+2y+5z
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