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9z+3=-3(-3z-1)
We move all terms to the left:
9z+3-(-3(-3z-1))=0
We calculate terms in parentheses: -(-3(-3z-1)), so:We get rid of parentheses
-3(-3z-1)
We multiply parentheses
9z+3
Back to the equation:
-(9z+3)
9z-9z-3+3=0
We add all the numbers together, and all the variables
=0
z=0/1
z=0
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