subtract the sum of 7x-5y+3z and -5x -2y+4z from the sum of 6x-3y+3z and 4x + 5y - 7z
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(7x-5y+3z)+(-5x-2y+4z)=2x-7y+7z
(6x-3y+3z)+(4x+5y-7z)=10x+2y-4z
A.T.Q.,
(10x+2y-4z)-(2x-7y+7z)=10x+2y-4z-2x+7y-7z(sign reversed due to presence of negative sign before bracket)
=8x+9y-11z
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