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=-9(Z-2)
We move all terms to the left:
-(-9(Z-2))=0
We calculate terms in parentheses: -(-9(Z-2)), so:We get rid of parentheses
-9(Z-2)
We multiply parentheses
-9Z+18
Back to the equation:
-(-9Z+18)
9Z-18=0
We move all terms containing Z to the left, all other terms to the right
9Z=18
Z=18/9
Z=2
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