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Question

(y^2+3yz+z^2)-(2y^2+yz)


Solution

(y²+3yz+z²)-(2y²+yz)
=y²+3yz+z²-2y²-yz
=-y²+2yz+z²
=z²-y²+2yz

Add or subtract the coefficients of like terms  to get the final result. 

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