1.

4xy -[ 6yz + {-7xy -(6xy + 3yz)+ 3yz} ]

Answer»

-9xy

Step-by-step explanation:

4xy-(6YZ+(-7XY-(6xy+3YZ)+3yz)

4xy-6yz(-7xy-6xy+3yz+3yz)

4xy-6yz(-13xy+6yz)

4xy-13xy-6yz+6yz

-9xy



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