If a = 4x - 3y + z, b = 2x + 5y – 4z and c = 6x – 7y + 2z. Find :
(i) a+b-c (ii) a - b - c
(iii) - a - b -c
(v) a - (b + c)
(iv) a - b - c)
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(i) 4x-3y+z+2x+5y-4z-6x+7y
=9y-3z
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