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-9(5z-4z-6)=78
We move all terms to the left:
-9(5z-4z-6)-(78)=0
We add all the numbers together, and all the variables
-9(z-6)-78=0
We multiply parentheses
-9z+54-78=0
We add all the numbers together, and all the variables
-9z-24=0
We move all terms containing z to the left, all other terms to the right
-9z=24
z=24/-9
z=-2+2/3
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