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