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-84=-6(4-2z)
We move all terms to the left:
-84-(-6(4-2z))=0
We add all the numbers together, and all the variables
-(-6(-2z+4))-84=0
We calculate terms in parentheses: -(-6(-2z+4)), so:We get rid of parentheses
-6(-2z+4)
We multiply parentheses
12z-24
Back to the equation:
-(12z-24)
-12z+24-84=0
We add all the numbers together, and all the variables
-12z-60=0
We move all terms containing z to the left, all other terms to the right
-12z=60
z=60/-12
z=-5
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