subtract the sum of x-4xy+z and 2xy+2z-4x from the sum of -6x+4z and -18z
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sum of x-4xy+z and 2xy+2z-4x is -3x-2xy+3z ---- (1)
sum of -6x+4z and -18z is -6x-14z-----(2)
subtract 1 from 2
-6x-14z-(-3x-2xy+3z)
-6x-14z +3x+2xy -3z = -3x+2xy-17z
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