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Verified answer
A.( 6x+9)-(5x+8)=6x-5x+9-8=x+1
b.( xy+7yz)-(13xy-2yz)=
xy-13xy+7yz+2yz= -12xy+9yz
c. (9x+3y)-(6x+2y+7)=
9x-6x+3y-2y-7=3x-y-7