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18z+18=-9(-2z-2)
We move all terms to the left:
18z+18-(-9(-2z-2))=0
We calculate terms in parentheses: -(-9(-2z-2)), so:We get rid of parentheses
-9(-2z-2)
We multiply parentheses
18z+18
Back to the equation:
-(18z+18)
18z-18z-18+18=0
We add all the numbers together, and all the variables
=0
z=0/1
z=0
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