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2(z-4)-4=6
We move all terms to the left:
2(z-4)-4-(6)=0
We add all the numbers together, and all the variables
2(z-4)-10=0
We multiply parentheses
2z-8-10=0
We add all the numbers together, and all the variables
2z-18=0
We move all terms containing z to the left, all other terms to the right
2z=18
z=18/2
z=9
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