Add 2x+y-z , 7x-4y+2z , -3x+4y
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=(2x + y - z)+(7x - 4y +2z)+( -3 x + 4 y)
=2x + y - z + 7x - 4y +2z -3 x + 4 y
=(2x + 7x - 3x)+(y - 4y + 4y)+( - z +2z)
=6x+y+z
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