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-7z-2(2z+6)=-12-11z
We move all terms to the left:
-7z-2(2z+6)-(-12-11z)=0
We add all the numbers together, and all the variables
-7z-2(2z+6)-(-11z-12)=0
We multiply parentheses
-7z-4z-(-11z-12)-12=0
We get rid of parentheses
-7z-4z+11z+12-12=0
We add all the numbers together, and all the variables
=0
z=0/1
z=0
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